It seems to me that Musk's eco-credentials have been long largely abandoned, assuming he every really had them to begin with. I get the sense that they were only ever useful to help sell cars and support his ego-trip (make him seem a "visionary"). None of his other projects are particularly eco-friendly (a tunnel, but just for cars, big rockets, autonomous cars rather than larger scale transit, etc.)

I think the more likely reason Musk and Trump will fall-out of... whatever it is they have... is they both have huge egos and don't like sharing the spotlight.

My feeling is that, while the rest of Big Tech is busy kissing Trump's ring at Mar-a-Lago, Musk is something between Trump's consigliere and Trump's owner.

I also don't think that it's going to end well for them, but it might last a while. Also, Trump is pretty old, so it's entirely possible that he'll die before they have a falling out.