no, the airline claimed that it was a requirement of the Thai government. Again, this was after it was well known that all requirements had been dropped. I had the same type of thing happen on the way back from Singapore. They were handing out arrival cards that were no longer required or wanted. They all ended up in the waste bin at immigration.
no. There are national policies like the end of covid restrictions but some embassies still show the requirements. They are just not good about updating their websites.
the airlines don’t know anything. After all restrictions were dropped, I was flying back to Thailand from visiting the states on JAL. They demanded to see my vaccination certificate and said I wouldn’t be able to board without it. Luckily I still had it.