From what I gather the criticism from him and those like-minded individuals is that she's trying to shoehorn russiagate into this moment to divert the energy and bring it back to an issue that is over and that he was summarily right about. It all seems fairly vague. We know that foreign governments have always been interested in black, or left-wing "insurgent" movements, but so are the cops and The Feds for that matter.
I know he's anti-Russiagate, but I'm not sure of his specific position on Russian influence operations in the US Black community.
It seems that he's classifying this as a just another "Russians ate my homework" argument. However, I suspect he's basing that assessment on his disdain of Susan Rice and establishment Dems as a whole, because he can't dismiss Rice's counterintelligence knowledge and experience.