UPPL only monitors prop spawns. I don't believe scripted entities can be monitored by UPPL.
(Technically, SENTs don't even have to include/use a prop, they can be an effect/sprite)
I've think I've seen a few requests of Jay in his URestrict release to add the ability to control SENTS.
See the Releases forum here for URestrict, ask if he's included it there, and if not suggest it to him.