Interesting points.
Haven't things been kind of silently relaxing gradually? It seems that many places have been reducing covid restrictions gradually over time. People are sick of the restrictions, less scared of Omicron and generally try to see what they can get away with.
Also, most things built in Thailand have a very short period of durability and effectiveness, generally just take the photo then leave to collapse in a number of weeks. It could be the shelf life of the recent Omicron protections has been reached.
It wouldn't surprise me if most people were of the mind "let's just get it over with, we've seen what happens in other countries, that seems OK" regardless of what the top people are saying.