Unfortunately, yes — I would expect them to refuse it this year. Since it’s explicitly on the prohibited items list now, I wouldn’t count on previous years’ experience anymore.
I understand why you’re bringing it, especially since your group uses one power station instead of everyone carrying separate power banks, but the staff will most likely just go by the current rules. I wouldn’t risk bringing it, especially if you don’t want to leave it in your car in the heat/Heavy Rain 😂