if your entering Thailand with a retirement visa with unlimited entries from the Thai royal embassy in your home country and you don’t stay longer then 90 days in Thailand you don’t need to do a TM30. I’ve never done one and never had a problem entering or exiting Thailand. I do stay at the wife’s house not a hotel
I’ve never registered with my multi entry but I’ve always left at the 90 day mark and never had a problem entering or exiting without registering a tm30
I arrived last week and when I asked immigration that same question at the airport I was told not needed anymore if your using visa on arrival. I had my Thai wife ask again and they answered again not required for visa on arrival.