Worth noting that CPM revenues on Facebook are down about 53% in that same timeframe, so it is possible that "most advertisers have returned" and that "Twitter ad revenues are down 59%" are both true statements.
I mean personally I have almost never used twitter and I wish it'd burn to the ground just on the principle that it creates trash content and arguments by design.
Still, for all the fire and brimstone predicted (and I was one of them) it's running, and probably capable of running at a loss for quite some time.
https://www.businessinsider.com/leaked-twitter-documents-ad-...
Not that it's worth much but I recently deleted my Twitter account (and then a few weeks later, also, my Reddit account)