Okay let's sort out what document
@Mikki *******
included in the post
This is NOTHING but a paper that the immigration office has EVERYONE on retirement extensions sign (and usually hold up under their chin to get a photo of them with it) to let them know IF they have an OA visa that the insurance requirements changed on Oct 1st from the old 40k/400k out/in-patient coverage to 3 million baht (100K USD) coverage.
It has NOT the requirements for getting an extension on an O visa based on retirement, it's just a form you sign and get a photo holding so that IF you're on an OA visa extension you can't whine to them next year that you didn't know the insurance changed to a higher coverage