Pulverizer: Passive Bonus: Increases the critical threat range of bludgeoning weapons you equip...Does not work with Sireth (Quarterstaff) due to the weapon not having a bludgeoning damage component. Does work on Blunted Ammunition ranged weapons though.
Adding/changing the damage type of a weapon changes its damage type just because it was originally a bludgeoning type weapon doesn't preclude it from gaining other damage (or weapon) types.
Another fun example is the Sun Blade...its a bastard sword that for all purposes of any feats etc. is a short sword despite originally being a bastard sword...proving once again that when an affect adds or changes a weapon OR damage type it should apply to feats,etc.
The ONLY reason that Wolf/Bear Form use IC: Bludgeon is because the Devs were to lazy to give it unique coding like Sunblade, Blunted Ammunition or Sireth.