If we accept Google's own claims, they have an automated indication which leads to suspicion of that and on ongoing investigation, not even something where they are prepared to claim an actual violation. i.e., exactly the circumstances where every half competent organization would decline comment (potentially citing “personnel matters” until they'd actually completed an investigation.)
So you say you suspect they have an ongoing investigation, and that would be "circumstances where every half competent organization would decline comment"
What substantiates this conclusion? They can have an investigation ongoing, and share the cause for said investigation. In the statement they explicitly establish that this doesn't imply guilt of the account owner.
What about Mitchell's violation towards Google?