Everything I have ever read about Advantage plans is that they require the participant to live in their assigned Medical Coverage area. If you lie you will be inevitably be liable for huge bills, at the very least. Worst case scenario: guilty of insurance fraud.
https://www.ehealthmedicare.com/medicare-advantage-articles/what-are-the-pros-and-cons-of-switching-to-a-medicare-advantage-plan/#:~:text=Medicare Advantage plans have specific service areas.&text=To enroll%2C you must reside,6 months of the year.&text=The trade-off is that,receive payment for covered services.
"Medicare Advantage plans have specific service areas.
Most Medicare Advantage plans have regional (rather than nationwide) networks of participating providers. To enroll, you must reside in the Medicare Advantage plan’s service area at least 6 months of the year. If you divide your time between homes located in different areas, this requirement may be difficult to meet."
https://www.pbs.org/newshour/economy/retired-expats-question-remains-keep-medicare-coverage-not#:~:text=Medicare generally does not cover,cover emergency foreign medical expenses.&text=However%2C they do need a,Part D prescription drug plans.
"Establishing faux residency in the U.S. may provide comfort to some Medicare enrollees. But I would not use it to maintain Medicare Advantage or Part D coverage and risk having an insurer reject a huge claim. And believe me, these are the kinds of claims that insurers are motivated to question."