If you look at the article that was attached to the drop, at the bottom it mentions the report that there won't be anything coming out of Durham before the election.
Last couple of lines of the article..."Earlier Friday, it emerged that Barr had been warning Republicans that a review of the FBIs Russia probe would not be finalized until after the Nov. 3 election."
Just my theory, but I think this is what he was referring to.
That makes sense - good decode :)