A friend who is a retired T made what I feel is a valid point about T not responding to this. Having read the actual email that was sent to him she said I called him out on some pretty serious professional mistakes (no ethics violation type things but mistakes). She said if it had been her she would take my concerns to supervision before coming back to address them with me. She also said it might take a bit depending on how he does supervision for him to talk to someone.
I thought it was a reasonably valid possibility.