Itʻs obviously sasukeʻs S/T even if we didnʻt have naruto explicitly stating itʻs his left eyeʻs ability.
Naruto outright blitzed the same kaguya whoʻs
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Then thereʻs the fact that while madara calls sasuke fast, kaguya calls naruto fast, and while sasuke could blitz madara with his S/T he couldnʻt even touch kaguya with it.
if people want to claim that sasuke moved there without S/T, they have to have some compelling argument, else all the evidence says he used his left eyeʻs teleportation ability.
and sasukeʻs chidori didnʻt touch naruto as chidori doesnʻt send people flying, it stabs them, and it makes no sense for sasuke to use a katon to distract naruto, and then follow up with his S/T tech only to hit naruto with something that wonʻt even harm blondie.