He did not borrow 44 billion to buy Twitter.

He put about ~13 billion dollars of debt on Twitter itself, so he had to come up with about 31 billion in equity. He was able to secure third party equity commitments of around 7 billion (Larry Ellison, the Saudis, etc.). He also held a minority interest of about 4 billion in Twitter. He funded the remaining 20 odd billion with a combination of cash (from cash holdings and selling Tesla shares in early 2022) and equity margin loans on his remaining Tesla shares. It is understood that he likely paid off most of his margin loans as he continued to sell further Tesla shares in late 2022.

The 1.5 billion interest expense you mention is just for the bank debt (that the banks still hold, and have been unable to sell), and is Twitter’s responsibility, not Elon’s.

This is a long way of saying that I think the banks will own Twitter within 6-12 months. They will not roll over like landlords, and its far more clear cut for a missed loan payment.