Block/Charge on Dunk

[Scrapper1]

There are so many things that you can't tell from a a still photo. But IF the defender was at the spot before the shooter went airborne and IF he didn't move laterally or forward while the shooter was airborne, then I think it looks like a pretty clear PC foul.

Maybe the official thought the contact was not squarely in the torso, like the shooter was going past the defender laterally. But from the photo alone, I would agree that it looks like a PC.