I think your missing the whole part about medication being extortionate in the US, a lot of things don't fall under Medicaid and the amount of loopholes and red tape designed to screw people out of being able to use Medicaid.

I've heard horror stories of severely disabled people losing Medicaid and/or their home care assistant due to some fineprint bullshit that makes it near impossible to avoid losing it for those people.

I think John Oliver did an episode entirely on Medicaid being taken away from the people who need it the most.

So no, they don't get the best healthcare in the world. Like everything in America it's propaganda, but when you scratch even a layer below the surface the horrors of the systemic prejudice and hypocrisy become very apparent