is one piece episode 159 filler?

Luffy, Usopp and Sanji begin their journey to Upper Yard and Usopp is questioning if Conis was going to be alright being that she is now branded as a criminal like them. As they head into Upper Yard, they comment on how huge the forest is.

Just as they begin advancing into the forest, they are attacked by a big moving scythe. Luffy uses Gomu Gomu no Bazooka to help them escape.

Just then they are again attacked, by wooden spears. Sanji and Luffy kick them off and Luffy uses Gomu Gomu no Kazaguruma to get them past.

Just then, a razor boomerang appears and begins attacking them.