I think he's just been super into X for decades starting with some /r/Ithinkthisisdeep mathematics symbolism he placed on it way back when he co-founded X.com before it was bought by PayPal. He puts it into literally everything. I don't think there's much more to it than an edgelord trying to brand himself around a cool sounding letter with quasi "I am very smart" mathematical symbolism. Highly doubt the dudes a Nazi. It's genuinely far dumber than that.