is one piece episode 206 filler?

Vice Admiral Jonathan puts into action his "9 o'clock" trap; during 9 o'clock, the base can use periods of low tide to prevent the ships from escaping. So, when Luffy commands the ship to go full speed ahead, a hole was torn in the hull by the rocks on the harbor floor.

The harbor eventually reaches a very low tide, rendering the ship unable to move. Jonathan gloats via megaphone how he had captured the Straw Hat Pirates.