Based on Spring Break, if things continue to go well, HHN will actually come close to Chapek's dream: I think Universal could just tweet "it's open" and not even have to worry about marketing. If things go sideways again, I don't know that Universal wants a third party getting input into how they respond. Rumor is that's one of the factors that sank 2020.
I could see an "in-house" IP (how great could Creature from the Black Lagoon work in that space?!) to try to move a little more merch than a nondescript haunted house set in Ohio or whatever might not, but I see little benefit in the cost of using a third party.