You must not know much about Thailand as they have stopped buying US since the 80s so NO there are no pro-US in the Thai Armed Forces just look at the weapons.
Actually if they offered the RTA the Type 99A2 than it is worth considering but I do not agree on the MBT3000 - T-99A2 China Type 99...
The decision of the Royal Thai Army is more politically motivated as Ukraine has come under USA influence as noted in the article RTA are only looking for tanks from countries that USA has no influence.