Is autism more prevalent amongst students in well-ranked universities? I read on 
https://www.wired.com/2016/10/president-obama-mit-joi-ito-interview (mirror):


  And if we were able to eliminate autism and make everyone neuro-­normal, I bet a whole slew of MIT kids would not be the way they are. 


Is autism more prevalent amongst students in well-ranked universities (vs. all universities)?
There is research to suggest that the general belief (or stereotype) is accurate relative to subject area - specifically, some (but not all) areas of STEM (science, technology, engineering, mathematics) have a greater amount of autism prevalence than would be expected by pure chance. There is no research I can find that considers rank of University comparatively, but there is research that compares the prevalence of autism spectrum signs/symptoms/behaviors/classifications between various fields.

Science, Technology, Engineering, and Mathematics (STEM) Participation Among College Students with an Autism Spectrum Disorder


  Findings suggest that students with an ASD had the highest STEM
  participation rates although their college enrollment rate was the
  third lowest among 11 disability categories and students in the
  general population. Disproportionate postsecondary enrollment and STEM
  participation by gender, family income, and mental functioning skills
  were found for young adults with an ASD.


Selected quotes:


  Young adults with an ASD had a higher proportion of majoring in STEM
  related fields (34.31 %) than any other disability groups. The
  difference was significant for seven out of the 10 pair-wise
  comparisons. When we broke down the STEM related fields into computer
  science, engineering, math, and science, we found that the high STEM
  participation rates among young adults with an ASD was mainly driven
  by a high concentration in science or computer science majors. Young
  adults with an ASD were significantly more likely to major in science
  (12.12 %) than their peers with LD (4.72 %), SLI (4.71 %), ID (5.40
  %), HI (4.80 %), OI (1.45 %), OHI (4.55 %), TBI, or MD.1 These young
  adults with an ASD were also significantly more likely to major in
  computer science (16.22 %) than those with LD (4.06 %), SLI (5.90 %),
  or OHI (5.19 %). However, the high prevalence in STEM majors for young
  adults with an ASD was not found in non-STEM majors, such as health
  science (7.64 %) or social sciences (9.52 %)...
  
  When focusing on STEM majors, the odds of STEM majoring were 13 times
  higher among males with an ASD than females...
  
  These results provide the first national picture of postsecondary
  enrollment and STEM participation for young adults with an ASD as well
  as their peers in 10 other disability categories. Our analyses suggest
  that young adults with an ASD who attend college are most likely to
  pursue STEM majors. However, they also have one of the lowest overall
  college enrollment rates...
  
  Despite a previous lack of national evidence, the idea that people
  with autism might be predisposed to choosing and succeeding in
  STEM-related majors and jobs has gained a footing in popular press
  stories and among advocacy groups (Moore 2006; Morton 2001; Ross 2006;
  Safer 2012). Our findings confirm that individuals with an ASD are
  more likely than the general population and other disabilities groups
  to gravitate toward STEM. The STEM major rate (34.31 %) for young
  adults with an ASD was not only higher than their peers in all 10
  other disability categories, but also higher than the 22.80 % of
  students in the general population that declared a major in
  STEM-related fields in postsecondary education (Chen and Weko 2009).
  In addition, this study found that young adults with an ASD in STEM
  fields were more likely than the general population to concentrate in
  science [12.12 vs. 8.3 % (Chen and Weko 2009)] and computer science
  [16.22 vs. 6.6 % (Chen and Weko 2009)].


Note that this indicates that people on the autism spectrum are more likely to choose certain fields, such as computer science and engineering, than is the general population - but people on the autism spectrum are also less likely to enter college at all compared to the general population.

This study links to many related studies, but only notes one other similar study in a single United Kingdom university that showed a correlation between autism and mathematical skill. All studies in total still make it impossible to compare higher and lower ranked institutions.

Finally, note that the mention of MIT is notable not simply because it's high ranked and famous - but because it is famous for a specific set of technological developments, related to AI (the topic of much of the interview in the OP), as well as engineering and computer science generally. 

You can go about this in a rather sideways manner, however, from this one note from the above study:


  Young adults with an ASD were less likely to enroll in a 2-year
  community college (27.66 %) or a 4-year college (14.95 %) than all
  other disability groups except intellectual disabilities (ID) or
  multiple disabilities (MD) (Table 3).


This shows that autism is less prevalent at unranked/low-ranked institutions period, so you could roughly infer that those with ASD who choose to go to college at all do so primarily at institutions which are more likely to be ranked (or ranked relatively highly). This is a rather weak argument, but it's about all we seem to have to go on.