Any US citizen experience with the US Embassy and Foreign Health Insurance to be “certified” for Immigration Visa?

I have a question, does Thailand accept a foreign insurance card for example; I have Humana and they cover me anywhere in the world if I was to contract covid-19. With zero out-of-pocket cost to myself. 100% covered. So just wondering if this would be accepted or you still have to buy Thailand's insurance? I'll be leaving Thailand soon but will be back later just like to know this up front.

My question does anyone have experience with this foreign health insurance

Me again: With the revival / extension of the STV (Special Tourist Visa) - two questions:

1) Any news / rumors on whether they will also improve the underlying conditions, like:

- no pre-paid accommodation requirement

- allowing for foreign health insurances (instead of expensive Thai health insurances only)

2) Anybody managed to fulfill the proof of accommodation requirement by presenting an invitation letter of a Thai national, confirming free accommodation is his / her house?

Thank you.