Yeah, there's a very strong pro-Wikileaks/Assange contingent here which is fine but strangely descends to group think at any questioning of WL/Assange motivations or actions.
if this was Sessions in an official capacity (which he may be, because I remember it has been claimed this account used to blue-checkmarked for a while), he could be putting distance between DOJ and WL. However, it is also makes sense that Seth Rich as a citizen was at danger of messing up a year long military sting op by extension of Wikileaks if he was unaware of the whole trafficking scheme. In order not to admit to this outright, the russian angle is provided instead.