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“emusk” could also stand for “Edward Musk” or “Elisabeth Musk”. And there might be even more then person with the name “Elon Musk”

As long as it does not say:

CEO of SpaceX, CEO of Tesla, Inc., CEO of Neuralink

on the profile (it doesn't):

I would say it's not the “Elon Musk” you are thinking of but I I can't see anything wrong with using “emusk” as account name.