Most of the countries in BRICS do not trust each other or are rather not in good relations like India and China. There is a lot of friction while using their national currencies in trade. They might try to build something based on gold settlement layer but maybe they will come to the conclusion that Bitcoin fixes this.

Anyhow, now they need USD and they will need it for some time now. This is debt based system and large part of their debt is in USD. Of course they do not like USD. First warning was GFC when their UST reserves got devalued then after Russian invasion on Ukraine they saw how quickly those USD assets might get taken away from them. So I agree BRICKS and other countries would like to get freed from USD hegemony but it takes time.

It will come I think but hey, I know shit.