I thought we were all told a few years ago that it wasn't possible to rig an election, at least not to any degree that would change the outcome. A lot of people were called crazy or worse for believing it might be possible.
Mueller correctly stated there was an orchestrated disinformation campaign by Russia. That's different than Russians under voting tables stuffing ballots in their pockets. the two are conflated so that the right wing can call it all the 'russia hoax'