It is the year 2023, and I'm getting booted off a conference programme because "presentations have been planned as an in-person event" and the facilities don't have the required technical set-up.
Wow!
The only way this argument flies at all is that on campus presenters will not have access to the internet and their PPT slides have to be transformed into actual dia-positive slides for use on a manually handled projector? (I know the campus, BTW. Neither is the case.)
In danger of sounding like an entitled whatever, this is a plain lazy and, frankly, privileged and exclusionary excuse! in 2013, when I organised my first ever own conference, we managed to have two remote presenters from two different time zones present remotely and it worked.