I agree that it's probably unfortunately negligible, but more for the reason that people are (sometimes voluntarily) swept up into the hysteria that's already been established and thus are unlikely to be moved by any retraction, more than for the reason that of course the Dept of Energy's intelligence group obviously wasn't in a place to issue an opinion so let's retract the silly thing we said before in the interest of the truth. The game is being played on the plane of what we can get people to believe instead of what the facts actually are. In other words, it should be negligible because the thing originally claimed not only had no basis in reality, but even if that thing were true, it wouldn't mean anything- as you say, those big 4 are important enough on their own. But it is negligible because people are operating on a narrative rather than a set of facts, and the narrative's atmosphere has to prevail.

Not to split hairs, but at the most, we can say those 4 agree that Russia attempted to hack (entirely unsurprising). That feels different to me from the claim that hacking occurred, thus illegitimately electing Trump, blah blah, as many in the media have claimed.