Musk leveraged TSLA stock to buy Twitter.
The 6.25B loan, assuming he still has it, is really not an issue considering his net worth. He can add more collateral or sell a bit. In fact TSLA stock is higher now than when he bought Twitter.
Wikipedia say Musk has repeatedly described himself as "cash poor" -- most of his worth are not in cash.
How much of his net worth are in $TSLA?