@lkg4answers Thank you! I just did a search. Reddit has the answer:
“Veteran here, priority enrollment is pretty sweet. Get a choice at the classes I want anywhere from one week to three weeks before most of the campus population. Major restricted classes are still in effect though”
So you are right … However, I looked at the class schedule: we are good. Most of the restricted classes are upper-division, which he doesn’t need to take. All the GEs are non-restricted.
This is the list of codes on the class schedule: https://www.reg.uci.edu/enrollment/restrict_codes.html