Well, I don't know about Obamacare, but I thought Medicare did not cover any medical expenses outside of the US. That is one of the reasons seniors need international health care policies when traveling outside the US.
I don’t know about any of that. I seem to have heard that you can have medicare coverage of citizens abroad but can’t swear that it isn’t just my imagination.
If what you say is true one would think no one would retire abroad.