These reports are not full audits, although Tether would certainly like us to think they are! If you click into one of the reports, the auditors list the steps they took, and they're focused almost entirely on verifying the existence of Tether's self-reported assets on the report date. They would not, for example, have uncovered an FTX-style "hidden, poorly internally labeled fiat@ account" by following these procedures.

You'll also note that they're following the "International Standard on Assurance Engagements 300 (Revised) ~ Assurance Engagements Other than Audits or Reviews of Historical Financial Information", which heavily suggests that this is not an audit and they did not review historical financial information.

It's not an audit. Attestations mean they move a bunch of funds into the account, get the auditor to check that indeed that money was there at that point of time, then move it away again. Every legitimate auditor they've engaged has quit.

Also, the 'auditors' they are approaching are more and more into the 'not quite competent' end of the line if you look into them.