There was one time the IRS “corrected” my return and sent me a tax bill. I disputed this through written correspondence, siting various sections of the tax code. I was able to get away with it. But, had they dug deeper, they might have found a reason to reject it… but they didn’t. I consider myself lucky, not vindicated.
Similarly in this case, I have to believe the IRS hasn’t looked into it deeply or doesn’t even know that Thailand is not imposing any tax. If they ever dig into this, what do you think is gonna happen? I have a pretty good idea.