He was trying to get out of it because it was a stupid deal at that price, not because he couldn't understand a contract. He was trying to limit the dumb consequences of his dumb impulse.

Failing at that, he might as well lean into it. He's got enough money to make billions of stupid mistakes, and this stupid mistake gave him ownership of his favorite thing. A favorite thing that incidentally gives him leverage against a US government desperate to control social media, a US government who is basically a business partner on every company he has.

He's likely to extract a load of profit out of twitter through that, anyway, we just won't see it because it will show up in his other businesses in the form of contracts, favorable regulation, and favorable legislation.