That's the reason to deeply cut expenses and to try and make more money. He could probably have serviced that debt if everything just kept going as normal (no big ad spend cut) and he had fired everyone but that's an impossible scenario.
That's not true if media reports about the purchase was accurate. The debt financing was only $13 billion: https://www.google.com/search?q=musk+buys+twitter+%22%2413+b...
The more complete funding structure[1] looked like this:
+ $24 billion : Elon Musk personal wealth (e.g. selling some of his TESLA stock to raise money)
+ $7 billion : other equity investors (Saudi Arabia prince, Larry Ellison, etc.)
+ $13 billion: bank loans
The Twitter puchase was mostly Elon's personal money (~54%) and not debt.
So, a handle of individuals can dwarf most countries GPD.
Nanometers?