As Toni said, it's in the protocols. A UR has to
extremely noticeable for me to see it, and also it has to be broadcast by Eurosport at a reasonable hour, which Evan's events were not

. You must have noticed the one event I did not list under "Evan got a UR" in my previous post... As for the WTT, just some semantics: he didn't win gold at the WTT, team USA won gold. Evan was first in the men's event. I believe the judges were very lenient with him there, he didn't take much of a GOE hit for his two called URs and the "!" (on the flip, I think?) in the LP.
IIRC, Evan also had some falls in the 2007-8 season, but as I said his main issue this past season has been the crackdown on URs and jump technique.