The question I'd have is were they supplied WITH AP rounds, or did they scrounge them up somewhere?
However if there's evidence the B-25G/H used AP rounds then we SHOULD have it in-game.
It ALSO sounds like it didn't matter if the shell was AP or not. Granted he's not saying if this is two shots in one pass, but the shaped HE charges were more than enough to knock out a Panzer, and probably not by having to put one up his tailpipe at 200yds. The B-25's cannon should be more effective against armored vehicles in the game than it is (now ain't THAT a scary thought).