Hm, why  Poloniex is also listed on this list (on the full version) while they don't have USDT pairs for a pretty long time? Polo doesn't have any fiat pairs for now. Also those 230 mln tokens on the treasury doesn't seem to be a part of the market. It seems like they store it in order to provide another "loans" if it will be needed.
You can also notify that they stopped creating new tokens after the investigation was started.
P.S. If CFTC will make their own audit and decide to erase Tether then Bitfinex will be probably shut down as they have the same people behind it. Think about it before making  a deposit on your Bitfinex acc.