To be fair, when USH was working on Jurassic World, existing TMs that were transferring to the ride were on site several months beforehand, while the rest of us weren't hired in until around May (roughly a month or so before the apocalyptic no warning opening).
Since this is an all new "thing", they're going to want to have staff ready for later this year. It's not like HHN where they can hire in the summer, have 1-2 rehearsal days/wardrobe, then EP night & boom... opening night.
Being a scareactor is a tough gig. With this being a permanent haunt & dining, they're going to require more time to prep.
I'm tempted to apply, but my body is arguing with my brain lol.. I'd love to suffer through the opening of this. #gluttonforpunishment