Thailand interpretation of "No Quarantine for Vaccinated foreigners"; has a different meaning from many countries. One might be fooled in thinking it means the same.
You would still require a CoE to enter, $100,000 USD insurance policy, PCR test upon arrival,maybe some sort of tracking app on your phone. God help you & your insurance if someone test positive on arrival. You will be locked away for awhile. Not sure if your insurance will pay and you are not COVID-19 positive. Scary to even consider coming to Thailand really. But the Thais would not state all of this on their colourful brochures.
They will not say there is a state of emergency, you will be locked up if found drinking a beer with a few friends at home, curfew from 9pm to 5am. You can see the inside of a Thai prison if you turn onto the wrong corner and encountered the protestors, you might be consider a part of. I doubt that would be on their colourful brochures.