I mean, it’s not really a “bombshell” when it’s just another person’s suspicion is it? The DNI doesn’t have any special insight into domestic electoral behavior. Probably less than a political scientist or polling expert. https://www.washingtonpost.com/blogs/plum-line/wp/2018/05/24/james-clappers-bombshell-russia-swung-the-election-what-if-hes-right/ …
I doubt that Clapper has that, but it'd not be impossible for the IC to know more about this. If they e.g. had a source detailing which districts where targeted and not, they very well could infer data that the public can't.