The fud around Tether seems to be based on people not being able to "see" whats going on and making an assumption or 3 from that. I've seen one claim there's 100m being printed every day, which is clearly not the case from the capitalisation of Tether. End of the day, Bitfinex makes a shed ton of cash from fees so has little reason not to back tether, if for no other reason than somewhere to park all that cash! They aren't even the biggest market for the token.
Normally I'd agree, but falling out with auditors doesn't happen every day unless something shady is going on.
If you change auditors, which is good practise to do every few years, do it inbetween. You don't do it in the middle of your first one, especially as you were already being called out for being sketchy.
Something is up here.