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I didn't know as well but @JReadsAndShiz answered it for and this is what they said
It means that it does not affect the main story or is it a part of it in any way apart from the fact that it is indeed an "alternate universe" of the main story where something happens differently, in short this does not effect the future of Ennead and is merely fanservice.
Im SORRY gais if this is out of topic BUT
What is canon