is bleach: thousand-year blood war (bleach: sennen kessen-hen) episode 14 filler?

In the distant past, innumerable portions of Souls come together to form an infant, which is held aloft by thousands of hands. As the hands glow with blue light, become tethered to the infant by red threads, and start to wither and desiccate, their owners chant the name of the infant: "Yhwach", who begins rapidly maturing into a young man.

In the present, Ichigo Kurosaki walks up the long steps to Ichibe'e Hyōsube's temple atop a mountain with Ichibe'e himself.