is one piece episode 302 filler?

Freed from her sea stone handcuffs by Franky, Robin returns to her normal self. With no way back, the two decide to capture the ship Spandam had intended to use to bring Robin to the Marine headquarters.

Unfortunately, Vice-Admiral Doberman, one of the respondents to the Buster Call, arrives. His battleship takes a shot at the stockade and blows a hole in it.

The next attack by Doberman is shooting at the Tower of Justice, causing its already broken upper half to crush down into the waterfall.