Is health insurance mandatory for retirement visa applicants in Thailand?

I just wanted to get a quick confirmation that the following is correct (Then you can lock the topic), as I've seen conflicting information from different sources and trust this group's advice more than most.

The requirement for insurance for retirement visa holders, is likely (Specifics of policy not confirmed by immigration yet & as always can be potential regional interpretations), to not affect people on extensions of stay, as it should only affect people who apply for a "retirement visa" from overseas consulates etc.

Sound correct?

Thanks in advance.