Nah. Musk accomplished his goals -- get into all kinds of government databases and collect/download a treasure rove of information on all Americans, he killed agencies/investigations into his various companies, extended his government subsidies and probably awarded himself some new contracts on the way. He's also a white supremacist so he's completely on board with the heinous actions of DHS/ICE and he also stands to benefit bigly from any tax cuts for the wealthy in the BBB.
He's simply trying to save face for potential customers of Tesla, etc. He's like MTG -- "I didn't know *THAT* was in the BBB" and now I'm against it. After I voted for it. Get the fuck out of here with that bullshit.
It would, however, be funny to see Trump stab him in the back now and either deport him or ruin him financially. I do, though, think Elon had a HUGE hand (legal or otherwise) in getting Trump elected so they both might have the goods on the other that nothing comes of this. Too bad -- I wish it would go down like the final scene in Reservoir Dogs.