Ok I'm confused now. So is this thing considered epaper, eink, both or neither?

Is one a subset of the other? If so which is the superset?

E ink is a trademark name for electrophoretic displays (magnetic particles) by the company also called E ink.

E-paper is an informal category that anyone can use for any display type.

The display in this video/article is also electrophoretic, but not all displays called e-paper are and it’s aggravating. An example: https://kentdisplays.com/products/color-epaper-displays/