is one piece episode 584 filler?

The G-5 ship is slowly advancing and the crews are all wearing gas masks to protect themselves from the poison gas. Smoker then spots something and Tashigi commands the people manning cannon to fire at the direction he pointed out.

The ice shatters and crumbles away in the aftermath of the firing only to reveal a river. The crews are amazed and four of them question how he noticed it in an overly casual manner, causing Smoker to punch them and answers that the sea currents are a giveaway and that they have to pay more attention, as well as checking on their own behavior.