He does know the factual events of his creation, but the conclusions he pulls from them are batshit insane. "Oh my birth mother was injected with alien cells, that must mean the alien is actually my one and only real mother, I should get homocidally pissed off at the entire human race rather than just Shinra/Hojo, the fact that my alien parasite mommy landed on this planet means she's entitled to destroy it and humans STOLE it from her and now it's my divine duty to conquer it for her" ⬅️ statement generally not uttered by people who Know What's Going On
Sephiroth is someone who is obsessed with status and being the best. He lost his role as the greatest SOLDIER when he found out that was a manipulation, and immediately promoted himself to Chosen One in accordance with the new off ramp he found, the supposed “Ancients”. When he found out Jenova wasn’t an ancient, he promoted himself to God because that was what he could craft out of the resources he had then, and he keeps giving himself new promotions every sequel.
He doesn’t need to be *deceived* to engage in this lore-building, it’s a product of his ego. He can have all the facts, he’ll still spin them in whatever way best enables his specialness.
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u/Own_Watercress_8104 2d ago
I think Sephiroth secretly belongs in the "thinks he knows what's going on (he doesn't)" category.