I read, if I'm not wrong, about the given atk self kit to tourists arriving after the 1 Nov (also from low risk countries) to be used for the 6/7day... so let's say that there will be 2 tests not only 1!!
TLDR : Answer Summary
There are updated guidelines for tourists arriving in Thailand after November 1 that suggest the provision of ATK self-testing kits for use during their stay. Tourists may need to conduct two tests, not just one, over a 6 to 7-day period.