It's not quite "lost down the back of the sofa" quantities, even for him, but I don't think "being forced to buy Twitter" is a big issue, rather than being forced to pay out for not buying Twitter. If the settlement forces the sale to go through then he's no worse off than if forced to just donate the same amount as punitive penalty without even having a holding at the end of it.
(Should it be "pay this amount, regardless", then actually taking control even of the suboptimal platform would be like that but "...and hey... free Twitter!")
Really, I expect Musk can make it work (in his own way) without too much fuss. He's no stranger to online hubs, and if he fails after he has raised such deal-threatening concerns then it exonerates him and makes us perhaps a bit more sympathetic (to balance against any feelings of schadenfreude we might also have until the next big thing, good or bad, wipes this whole episode from our collective memories). While if he makes it (continue to) work then he becomes the saviour of mankind in that way, as well as any eggs/baskets redistrubtion he initiates through his space programme. He hasn't much to lose that he hasn't already theoretically committed to put into the pot. Perhaps.
Possibly the gameplay was never meant to be more than an advanced "Outsider Trading" venture. Perhaps it has gone horribly wrong. Or perhaps it's still going horribly right, according to plan. I'm sure he knows, himself, but I doubt we can disentangle the front from the deep thought processes grinding away in his internal gears, ratchetting up the building costs and/or benefits of this particular wheeze.