Even in Lumina, Ushi goes out of her way to call them “Pure Eyes”.
(also tbh, that death boundary is far better than anything ryougi has done with her eyes)
There’s also a paragraph from KT that implied that Shiki was the result of the Nanaya’s research being successful,rather than something purely innate like Ryougi
「究極」= ultimate, finality, or absolute end
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Though their powers are similar yet fundamentally distinct, it may be misguided to compare them. Even so, Kiri understands he falls short by that very standard.
Only those who have made "death" a finality can oppose this demon.
But Kiri—who merely researched death and lacked it from the very beginning—could never ascend to such heights.
If anything could rival this demon, it would be something broken from birth, just like the demon himself.
It makes sense for pure eyes to be related.
Yeah in the end result, MEoDP is a freakish mutation of both Pure and Mystic Eyes so I can't really disagree on that being the case for Tohno vs. Ryougi but it ultimately hits the same beat regardless.
So yeah it's basically just being pedantic for the sake of it after that.