I very much doubt it. If it was truly audited by a reputable firm then the question as to whether or not the USDT was backed should be clear. If that's the case then I guess we could be more at ease knowing that at least part of their claims are true.
I'm pretty comfortable that the funds are real and that has been proven. The hack is more of a PR and reputational problem that could cause serious issues. At the moment they are saying they can prevent the stolen funds being moved by amending the code. If that turns out to be the case they might survive this.