As Goddess says it was involuntary voluntary, but regardless he did say the words. I wouldn't say it was a 'minor' miscommunication, that sounds fairly major to me. The point is however he made it clear that he was resigning. Perhaps it was in the heat of the moment, and the next day he refused to sign the letter prepared, but that doesn't change the fact he resigned.
If he can't be clear about what happened in the heat of the moment 2-3 weeks ago, how can we trust his memory on the heat of the moment (in the room with a young girl certainly involves a lot of heat) from 10 years ago.
Like dia I only saw part of the interview, and I was doing something else, but also like her, that part stood out for me. My take was that he was prepared to resign, but didn't lower the boom himself. So he says, of course.
As to your last assertion, I have no opinion, not having followed the story anywhere but on here and the "other site" really. If he is innocent I do hope he follows through on his threat to sue, and I hope he takes CTV for millions.