If you read the details in some of the earlier articles about this, they avoided plenty of due diligence. But she also went to great lengths to prevent them from completing that due diligence. And for the minimal due diligence she did permit them to undertake, she only ever sent them fraudulent data and documentation.
There was an article on Bloomberg or WSJ that said the Director in the acquisition had a Teams chat where she said "sometimes you don't need to do due diligence at all" lol