I like this, a couple thoughts on it:

1. I wonder if it would be more effective or land better if it didn’t mention AI at all. You’re not rejecting because of the tools they used, you’re rejecting because it’s a poor request.

2. I’d suggest an addition along the lines of “by the way, since I’m not seeing anything here that would make me think that there might just be some misunderstandings, this request makes me trust you, individually, a little bit less than I did before, and that will be reflected in how I address future requests from you. Happy to chat about it though. Please remember that trust is what makes all of this work.”