it happened with some test and go hotels that when the program was cancelled they cancelled some of the bookings, so you would need to find somewhere that is still hosting this program. I could DM you the name of his hotel if you want to send an inquiry
it wasn’t a test and go, he has to stay for 5 days and his THAI PASS SAYS SANDBOX, he has to return to his hotel at night just as I said in my comment.
He is not in nor has a Thai pass for a test and go
I am telling you for a fact he flew into Bangkok, his Thai pass says SANDBOX on it, and he was allowed to leave his hotel after he received his test result on day 1 and returns every night