is one piece episode 152 filler?

The Straw Hats are awaiting Luffy's return. Nami is very upset that Luffy is taking too long and that they might miss the Knock-Up Stream.

At that moment, Luffy arrives. The Straw Hat crew set out and Cricket tells Luffy that The City of Gold or the Sky Island has not yet proven to be non-existent.

He tells Luffy that he may be laughed at; however, that is what romance is about. Cricket then thanks him for returning the gold.

The Blackbeard crew have moved out, and are looking for the Straw Hats to capture Luffy because of his high bounty.