If Social Security gives them a letter stating they are not eligible for Medicare part A. If the Marketplace says they can keep their plan and the subsidies if they are not eligible for Medicare Part A. Then the IRS says you must pay back all the subsidy we have BIG problems.
I don't remember in your prior posts about you saying that Social Security gave them a letter stating they are not eligible.
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Looking back at your posts, I see that you said, "They told me the person has the choice to keep the HIX plan or go down and talk to Medicare and see if they will let them in..."
So, are you saying the person will not even contact Medicare to get a letter of eligibility so that they can say "not eligible" on the subsidy app?