I don't think there's any problem with the group conversation.
You only pointed out the problem to me privately, and the verbal promise is not in the group conversation later. i.e. If the private conversation didn't happen, I have done absolutely nothing wrong.

The group conversation would establish essentially the entire history of what happened and would conflict with some of your forum posts.
The whole private conversation was founded on your gross misrepresentations and inaccurate statements.