I don't know man, my Occam's razor cuts another way.
The USA is ~$36 TRILLION in debt. Interest payments are now consuming ~20% of tax revenue...more than the defense budget. That's insane!
Musk is also absolutely correct about over-regulation and government bureaucracy stifling innovation and economic growth.
Then there's the amazing incompetence often displayed by the current admin... Witness Afghanistan, among many other examples.
Given a two party system, I can only think this election outcome was better than the alternative!
On the other hand, if he had been forced to buy Twitter against his better judgement, he may have an axe to grind against the "overbearing" administrative state and use the tools at hand to achieve his ends. No evil genius required, just happenstance and humans seeing patterns in chaos.
To create a federal executive department you need an act of Congress which is not very efficient.
It's much more efficient to just use the name "department" and bet on the chance that nobody would care about words, meanings, facts and rules.