::::I'm not sure what you mean by saying that 'thats how Wikipedia works'.  When the same word or term has multiple meanings or significantly different meanings in different contexts, we have a separate article on each.  In this case there were multiple meanings that, while denoting superficially similar creatures, had no connection to one another established by reliable sources.  It was therefore appropriate to simply link to them in a list.  Certainly the other option would be to try to set up a disambig. page and have each different reptillian humanoid article have a parenthetic addition to the title to separate them; however, a list seemed more appropriate in the present case. 
 ::::As for your second issue, there was actually very little material in this page on the extraterrestrial, David Icke reptillian humanoid, because of issues with notability and verifiability.  That has been the case for some time on this page, and doesn't really have anything to do with the latest rework.  The relevant material that was here has been moved to reptillian extraterrestrial.  If you feel that more material should be added to that or that it should be moved to a different page name, feel free to contribute there or start a discussion on that talk page.  Certainly reptillian humanoid (extraterrestrial) or reptillian humanoid (conspiracy theory) would seem to be options.