This is probably what happened.
Park Ops and Horror Night teams were told to keep things moving while the execs and decision makers kept an eye on the numbers, and did more research on if they could modify the event in any way to run safely. I assume the horror nights team were presenting ideas and modifications to try and make the event happen in a COVID world.
Suddenly, very recently I think they found their decision.
They either finally saw how the numbers were trending, how hard it would be to manage the parks in the dark at this event, and how they would take a severe financial hit due to attendance restrictions. Add in the fact that screaming in an enclosed space is just a disaster waiting to happen, the writing was on the wall. And they clearly finally came to that decision internally, at last.
Perhaps they were hopeful, to a fault, but I think we’re all on the same page now.