is bleach: thousand-year blood war (bleach: sennen kessen-hen) episode 37 filler?

In the past, at their home, Shunzan Kyōraku gives a set of hairpins to his wife, Isuzu Ise, but is surprised when she only accepts one of them. When Shunzan ask her why, Isuzu tucks the one she accepted into her hair and asserts that she wants him to hold onto the other one because it will give her comfort to be holding one alongside him when he is fighting Hollows away from her.

Leaning against a nearby post, a young Shunsui Kyōraku smirks at his brother, who headbutts Shunsui in irritation for wearing such an expression and orders him to go home and study, prompting a laughing Isuzu to get up and head inside.