Based on this Reuters article[0], it was more around $5.3B, but they were only losing 200M/yr.
> It's not clear how much of the $5.29 billion debt Twitter had before the acquisition was refinanced or remained with the company. It's also not clear how much of the $2.7 billion in cash that Twitter held as of the end of June it got to keep once it went private.
0: https://www.reuters.com/markets/deals/twitters-massive-reven...
Word was prior to the takeover, their debt was on the order of $200M.