"Saved lives" or "Could Save Lives" is a ridiculous, un-falsifiable, and unprovable claim.

First, it involves twisting correlation and causation into an Escher knot. Secondly, it's not even what cited source says.

Yes, "reduced mortality along a timeline for a certain demographic" is a good and desirable statistic, but there is no way that it translates into the self-aggrandizing and sensationalistic "ACA/Medicaid saved tons of lives" (whatever "tons" is supposed to mean, in terms of lives. Perhaps grossly obese people died less.)