Is that true?...absolutely. I’m supposed to pick delegates I never heard of who may or not support someone I’d never vote for. The delegates vote only for who they are told to vote. “Go Jeb GO?”
I think it’s actually that even though there is a primary in PA, the PA delegates are all unbound and don’t have to follow the winner on any ballot. (I could be mistaken)
So even if 80% of PA voters go for Trump the actual delegates can all vote for Cruz.
I think that would be disingenuous, but Cruz people will be perfectly OK with disenfranchising the Republicans in PA.