Note the difference between Elite and retirement visa: Elite Visa is a cost, meaning the money is spent and will not remain in your bank account. The retirement visa however, while the
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k has to be kept in your bank account, it remains your money.
Thai authorities have been very easy going. If you are non symptomatic, they'll advise you to self isolate. They'll even give you free medications, a digital thermometer and an oxygen meter, all free. But it's not necessary to report if you are non symptomatic and don't need or don't want the free goodies
You need to submit a signed document with official letterhead that shows worldwide Covid coverage, the amount, your name, passport number and renewal/expiry date. Contact your insurance, they'll issue it. Mine did within half a day.