I agree with all those who commented here. The headline is a joke and fake news. Out of curiosity I perused various websites and saw many where Thailand was not listed at all. I did see one where it was #10. Here's one from a 2021 article:
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Top 10 Countries for Retirement in 2021 based on climate, political system, urban infrastructure, healthcare, business support, affordable buying/renting real estate, cost of living and benefits for pensioners.
1. Costa Rica, 2. Panama, 3. Mexico, 4. Colombia, 5. Portugal, 6. Ecuador, 7. Malaysia, 8. France, 9. Malta, 10. Vietnam
Source: immigrantinvest.com/en/insider/best-places-to-retire-2021