You are misinformed. The point of the US-Thai DTA is to give US citizens living in Thailand a tax credit (taxes already paid in the US,), not to absolve them completely from paying Thai taxes.
For example Long Term Capital gains are taxed at 15% in the US, but are taxed as ordinary income in Thailand. But this is all getting into the weeds, when the bottom line is you're not going to file a Thai tax return.
I know Thai bargirls with millions of baht in the bank, and they don't pay taxes. That would be low hanging fruit for the Revenue Department, but they don't bother.
The only wrinkle is if a tax return is required to renew a visa. No sign of that yet.
You are making some big unfounded assumptions. The changes to the Thai tax regulations carry the power of law and require all tax residents remitting more than 150,000 baht (with certain exceptions) to file a tax return. If only to document that you don't owe anything.
The Thai Revenue Department is not being clear on the details. It seems they came up with the idea, put it in the regulations, and then forgot about it.
Lots of people panicked and applied for a Thai tax identification number, and were turned down.