No. They blacklisted the stolen tethers, and all they now have to do is issue a new batch of $30 million worth of tethers. In no way this puts them in the red.
Reversing Tether tx does nothing to recover those Bitcoins.
Edit: found this: https://www.reddit.com/r/btc/comments/7e1840/the_30000000_us...
It seems like people did in fact notice the $30m being deposited on Bitfinex and being used to buy Bitcoin, all before it was known to be stolen. Difficult to confirm a thing like this, but I wouldn't bet against it.
http://article78againstnydfs.com/docs/317-cv-01882-BitfinexC...