I had a similar issue with an old teacher of mine, who was subsequently fired for pedophilia, I remember something’s happening but being only 10 you can’t be sure you remember everything. The way that I see it is that, based on the evidence you have on its own, there’s not a lot that directly links to trauma. There are a wide variety of other factors that can explain your feelings towards this, trauma being one of them, but not the only one. Something unhealthy was going on but I don’t think it’s healthy to leap to childhood trauma. One of the few things with us stammerers is that you can find someone who has the opposite effect, I.e being able to speak clearer with someone who has abused them. Don’t deny your experience, but be careful about what you think that is! Sorry for the long reply