1. Even if that were true, why is your "set of people" representative of such a large fraction of the US population that it would sway an election?
2. Even if it were somehow representative, is it more plausible that all of these people were on X getting these ideas (a platform that is small relative to other media), or that these ideas were simply blasted everywhere?
3. And even if it were somehow representative, and they did get those ideas from X, what makes you think that not having those ideas "false" ideas would have changed the election outcome [1]? People more often use "facts" to justify political positions they've already made, not the other way around.