I have a feeling that Thailand’s Foreign Affairs Minister, Maris Sangiampongsa, does not know what he is talking about.
The way I understand it, BRICS is about using currencies other than the United States dollar (USD) for international trading between member countries of BRICS if the seller and buyer agree on the currency to use, nothing more. It has to do absolutely nothing with the Ministry of Foreign Affairs.
Incidentally, the choice to use a currency other than USD has always existed, long before the advent of BRICS.