I don't believe it was falsified but it was missing a lot of things that an actual audit would include. Not just verifying that money was in accounts but verifying what purpose that money was for and what the banking relationship / terms of use of that money was. I do believe Tether had ~$40M in USD in April but I don't believe that they were 100% honest with their banks about their business model, which is why I think they lost their banking relationships and haven't allowed the public to deposit/redeem Tether since April.

I believe that the memo released was not an audit.

And I believe that if you want to prove to the world that you have a bunch of money then you should do a full, legal, audit.

That's the bar. If they have all the money, then a legal audit will prove them right.

Not falsified. But literally stated "This is not in any way an audit and does not meet the requirements of an audit".