If it's not obvious on its own (de)merits, imagine if it had been information that potentially damaging to Trump. Would it have been "written off" at the first suggestion that it might be disinformation or shouted from the rooftops 24/7 every day until the election? That's the difference between reporting it or not based on "disinformation" or not vs. reporting it or not based on whether it would help or hurt the candidate you are campaigning for.
Normally they’d wait for the story to die on its own after a few news cycles.
And your comment about “crazy far right people” is correct and why we shouldn’t censor. The same websites that everyone rails against as “kooky and conspiratorial” (many are!) were the only ones actually reporting on this.
All of the stakeholders involved - CIA, mass media, political parties - have a vested interested in labeling websites as “disinformation” and pushing them out of the mainstream conversation.