We know for a fact that the cinematic was made by Metzen and was for an entirely different story, just with the same starting pieces. But with this retcon we now know for sure that we can throw her internal monologue in BTS in the bin as well and likely everything in Legion re: Helya as well in terms of having any connection with things going forward.
We took the piss, but "She has so high IQ that she disguised her motive and knowledge to herself in her own mind" is now canon lore.