you are incorrect. I applied for a one year extension of my visa but because my passport only had 6 months to expiry, the extension also expired on the expiry date of the passport.
"Where Thai domestic law is still silent about a foreign tax credit available for individual taxpayers under this circumstance, a provision under double tax treaties could provide relief from any double tax arising. However, the conditions, methodologies, and documents supporting the claim are still unclear."
Having lived in Thailand for 26 years I am somewhat cautious whenever I hear about something that is presented as a done deal.