is one piece episode 648 filler?

In the beginning, beneath the Green Bit where lies the Tontatta Kingdom, Leo tells Usopp that there's a subterranean way that connects Green Bit and Dressrosa which they would use as their way of transportation. The dwarf then brings Usopp and Robin to the kingdom's airport, Tontatta Airline (TAL).

Both Usopp and Nico Robin are impressed by whole airport system and its transport, which appears to be ridable insects and animals. Kabu and Bian appear, saying that they are ready to take off and that Leo was late.