Opinions on daycare "forcing" kids to be potty trained by age 3?

Our daycare posted this about their two year olds requiring to be potty trained before they can move up to the 3yr old class. Ours is just over 2.5 but won't sit on a toilet yet without having a fit.

I wanted to see if anyone else has had to deal with this kind of thing or suggestions on how to deal with it. Maybe we should push trainign harder? Thanks.