I'm trying to be as diplomatic as possible, but you're making it hard.
There isn't any diplomacy in misusing a word that inspires false confidence from investors.
Just say this:
Although I actually agree with you in that provably-fair is the wrong term for it.
Fix it, don't do it again and go on with life. Simple.
I'm not here to fight with you or cause any grief. Just trying to maintain the integrity of the word "provably-fair". I would hope you can respect that.
Edit: Maybe I was wrong about the claim in regards to BustaBit... the problem seems to be just on BustaDice... which is owned & operated by the same people regardless. However, I will keep searching tomorrow. I'm going to bed now and not cause you told me to! hehe It's all good Big Ry-dawg.