The ACA is responsible for bringing on far more than that, many got brought on through their employer rather than the exchanges though. The article I linked has the numbers on it, and the CBO was pretty much spot-on for the number of folks added by the ACA when you combine those who have insurance through the exchanges and those that got insurance through their employers due to ACA requirements.
And yes, the last-ditch effort was to delay the repeal until after the 2018 midterms to give the GOP a "win" while not having to actually do any work, and more time to hopefully get their own party on board to get 51 votes. Not fake news at all, it was accurately reported on by outlets all over.