I'm a USDT skeptic but a 2 cent deviation isn't much considering it has often deviated by more than that in the other direction. If it hits 90cents on the dollar I think things are serious.
Tether deviated by 10 cents last May, and then it quickly recovered. Tether may have its issues, but this move alone tells us absolutely nothing. Saying that Tether is dying because of this move alone is absolute nonsense.
Such deviations can happen when one or a few whales take out their tens of millions of dollars out of Tether, or put their cryptocurrencies into Tether (that's when it rises by 5-10 cents).