I consider a .223 or .224 bullet to be greater than .22 caliber. I guess PA leaves that up for interpretation.
It's hard to argue that a 22 caliber centerfire isn't 22 caliber. Rimfire 22's aren't 22 caliber either, by such a definition, as the guns are cut with .222" grooves as standard. I reside part-time time in PA, and no one I have ever spoken to regarding guns or small game hunting in PA interprets the law the way you have here, Paul.
But I agree that standard attribution error is going on here, with Gemby universalizing his rather specialized set of experiences, which is irrational at best.