There is good and bad in all countries. To write off a country based on anecdotal evidence is a mistake. The main factors are due diligence and the means to pay for the required level of care.
https://corpwatchers.eu/en/investigations/caring-for-profit-en/bupa-aged-care-homes-in-australia-the-uk-regularly-rated-inadequate
https://www.smh.com.au/politics/federal/24-years-18-inquiries-can-we-face-the-truth-of-aged-care-20210225-p575qs.html
https://www.independent.co.uk/news/uk/home-news/brithdir-nursing-home-wales-inquest-b1818123.html
https://www.theguardian.com/society/video/2022/oct/13/hidden-camera-reveals-abuse-by-care-home-staff-of-dementia-patient-ann-king-video
https://www.theguardian.com/australia-news/2022/jun/06/shocking-rate-of-sexual-abuse-against-aged-care-residents-barely-changed-since-royal-commission
https://www.insideagedcare.com/aged-care-analysis/19-years-of-care/scandal-after-scandal#company-wide-and-world-wide
etc. etc.
I see no reason for the definitive "thailand certainly isn’t the place to go." made by another poster nor your comments (although you obviously have every right to your opinion) without taking into account the individual in question's situation (existing family/support and financial wise).
Personally, I'd prefer to see my days out (even if I got to the stage of not knowing what day it was, never mind what country I'm in) in the country of my choosing than be forced back into one of the many scandalous "western" so called aged care facilities I've read about. The chances are you can more easily avail yourself of the level of care you want at a more affordable price in Thailand or neighbouring countries than in the west, the difficult part perhaps (not impossible part) being finding responsible carers.