Yet still there has been no evidence that this really happened. Again from your article:
"Obviously, we should reserve final judgment; there are still facts we don’t know. The timing is hard to follow: Flynn pleaded guilty and signed his cooperation agreement on Dec. 1, 2017; yet, the correspondence between the C&B lawyers is dated March 2018. That is, the lawyers appear to be revisiting terms of a plea agreement their client had entered four months earlier, not scrutinizing an agreement he was about to enter."