Yah, I'd love for "pitbull" to only refer to the APBT, but the reality of the matter is that "pitbull" refers to a type and we're better off working to educate in that direction and THEN break it down into actual breeds.
Sometimes you have to work with accepted terminology and shape it
She didn't say there was any aggression, just some shyness, which, when a dog is a rescue and has lived through who-knows-what, is no reason not to give him a chance, especially when there's an affectionate nature exhibited once he's learned you're not going to hurt him. Besides, it's not like they're planning on building a breeding line from him. They're just giving a sweet dog a chance to have a good life.