There is no mystery here. It went like this:

1. Musk signed a binding agreement to buy Twitter.

2. And then he got cold feet when he decided he didn't like the deal he made and he spent six months desperately trying to not buy Twitter.

3. And then he finally understood that he would lose the court case and that he had to live up to the contract and so he bought Twitter at the originally agreed price.

4. And now Musk wants Twitter users to pay for his poor business decision and fund him out of his debt.