I have tested, it's a nerf. Before the WBP, the WASP consumes about 16 seconds to completely wipe out a garrisoned MG42. However in the WBP, it consumes 20 seconds which already is the beginning of the third burst to wipe out a garrisoned MG42.
As a reference, FHT can wipe out a garrisoned MG42 within 10 second. Only 1HP is left on the MG team after the first burst.
Just... play the mod and come back to tell me with a straight face that UC's anti-garrison ability has not been nerfed.
if you need 10 seconds to react to prevent a wipe, the problem is not the game