Nobody on the House intelligence committee made this statement up. This came from Comey's own testimony before the U.S. Senate committee in June of 2017.
So how does a dossier go from being verified and accurate enough to be use for a FISA warrant application in October 2016 to being "unverified" 2-3 months later?
Not to take away from the seriousness of your charge, but...
James Comey happens to be a frickin' liar! Once somebody lies to me, it puts everything else that person says in doubt.
Actually Comey testified in fall of 17 that it was salacious and unverified after 4 FISC applications had been submitted!
He told Trump the same thing 3 weeks after he applied for the first one.