The first time I saw a posting to the effect that the charges boiled down to a few main aspects and all but one had more or less already been refuted was by
@tolmie's hairdoo on here (I stand to be corrected if that's wrong). This guy's wording seems fairly similar to me, while he also includes the formulation "I've heard ...", which I find rather vague and unsatisfactory. It certainly lacks a claim of a source with any authority.
I see from Twitter that City Rabin thinks this guy will be reliable, and maybe he does have a source of his own. My guess, though, would be that tolmie's information is doing the rounds and this guy has just picked up on it.