is one piece episode 749 filler?

In the underground mining colony on Silver Mine, Luffy, Bartolomeo, and Desire prepare to escape by taking a train track leading above ground. Bartolomeo is excited to follow Luffy, as it makes him feel like a member of the Straw Hat Pirates.

Desire turns to the enslaved miners and asks if they want to come with them, but the miners refuse, not wanting to face Bill's wrath. Bartolomeo assures them that Luffy will beat Bill, but they are skeptical of that.

However, Desire says that they are only waiting to die down here, so it would be better to take their chances at gaining freedom.