What he chooses to discuss on the forums is up to him and his team... certainly seems a bit ill-advised to me, but he's made a lot more money doing what he does than I ever will, so you have to assume he either knows what he's doing, or thinks he does. Either way, it's his choice.
So yes, the thought that more suitable investors might be put off from dealing with us in future because we now apparently have previous for leaking private conversations during negotiations does concern me more than that.