is one piece episode 625 filler?

In spite of Kuzan's presence, Doflamingo attempts to kill Smoker but is frozen by Kuzan's Hie Hie no Mi ability. However he manages to break free as the ice hadn't reached his heart.

Seeing nothing to gain from fighting Kuzan, Doflamingo decides to take his leave, but not before questioning Kuzan what he stands for due to rumors he had heard. Kuzan does not answer him and yells for a medic.

Doflamingo collects Baby 5 and Buffalo and departs.