the dta with the Us was signed off on by us ambassador ITOH, I was assigned to the embassy during this period 1996 or 97. SIncxe then, that statement article 20 states that the US social security is taxed ONLY by the US govt. IF you doubt me, just read the document id on https://www.rd.go.th/fileadmin/download/nation/america_e.pdf btw, there is an "_" between america and the e.pdf
I know, that's why I said " with your logic" .
Meaning that, if he was trying to declare it this year, he should have also tried to declare it for many years previously.