is bleach episode 206 filler?

The pendulum of time swings back to 110 years prior, to a time where although the events were brief, the effects remain long-standing. The events of the future are temporarily on hold so that secrets, forbidden secrets, from the past can be unraveled and explained.

In the Seireitei, Lieutenant Sousuke Aizen walks through the Fifth Division Barracks, greeting his fellow Shinigami while doing so, with the intention of speaking to his captain, Shinji Hirako. They briefly discuss the preparations for the Twelfth Division's new captain before making way to the First Division Barracks.

There, they are greeted by Lieutenant Hiyori Sarugaki and Captain Love Aikawa.