Once upon a time, it was acknowledged in academic circles that the ACA did little to cut the growth rate of health care costs. See, for example, 24:05 and following in this video:
But then in this economists' letter to Congress and the American public, the same parties are claiming that the effect of the ACA on health care cost growth is so tremendous (in the direction of less cost) that it would create up to 400,000 jobs EVERY YEAR!
Another (unrelated and) excessively truthful part of this video starts just before the 24:00 mark "The American public doesn't actually care that much about the uninsured. ...A lot of the uninsured don't care about the uninsured."