Apparently, Peter Di Rocco realized the error of his initial assertion because he is now saying something different.  At first he said, "86 percent of the decisions of the ninth circuit are overturned."  Now he is saying, "Eight of out of 10 cases from the 9th Circuit reviewed by the Supreme Court are overruled."  At first he was considering all decisions made by the Ninth Circuit, and now considering only those relatively few cases reviewed by the Supreme Court.

The Supreme Court tends to review controversial cases, and that's why many are overturned.  In fact, the majority of cases reviewed by the Supreme Court from ALL courts of appeals are overturned.  

If the Supreme Court makes separate decisions on different parts of the executive order, some of them may be overturned.  If the Supreme Court considers the entire executive order, the justices would likely split 4-4, in which case the Ninth Circuit decision would remain in effect.