Thanks, momx2 and 'Neato. Unfortunately, I think teacher has already spoken with admissions people and said not-great things. But you're right, at least he was upfront about it. I just wish he had expressed any reservations when dd initially asked him, over a month ago, so that she might have asked someone else. (This program requires recommendations from 2 school teachers; can't be music or dance.)
I will pin him down to specific examples of his concerns, though.
Thank goodness we have DITD on our side!