The track has never been approved by the FIA, NEVER. Which part of that is t that you don't get in your head?
Show us 1 source that says the circuit was approved by the FIA
Ecclestone agreed IN PRINCIPLE
https://www.ttgasia.com/2012/10/04/buyers-welcome-f1-in-thailand/
The kingdom is inching closer to securing a race for the 2014 F1 season after the Sports Authority of Thailand announced that F1 chairman, Bernie Ecclestone, had agreed in principle to a night race on the streets of Bangkok.