This is going to be the problem with not releasing the entire hit job report. They will leak bits and pieces and ginn it up into something it is not.
Of course, they’ll do the same to favorable allegations within it if it is ever fully released too. The only way I see to thwart them is to seal everything pending an investigation of the investigators.
Barr will release what he is allowed to release by law. If Congress doesn’t like the law they themselves wrote, passed, and signed; they can change it.