is bleach: thousand-year blood war (bleach: sennen kessen-hen) episode 28 filler?

Bidding farewell to his father, the Soul King, who has seen the future, Yhwach envisions himself as a young boy gradually growing into his present-day self while watching the Soul King separate the Primordial Sea into the Three Worlds with a strange ceremonial sword, causing Yhwach to be enveloped in the waters and return to his infant self as the Soul King's limbs are severed and separated. With the Soul King being bound in his crystal, a younger Yhwach sheds a single tear after recalling his sense-deprived infant self being buoyed by thousands of hands.