It's actually quite naive to talk about the "BRICS" in this way, because there isn't actually a solid relationship between them and they are not some solid trading bloc. You've just reeled off some random country names that are scattered around the world, that might have some sort of trading relationship with a BRICS country but it by no means aligns them in any other way. None of them, besides maybe Belarus and Cuba, are particularly bound to BRICS nations and do just as much business with the rest of the world. It's noteworthy that you haven't actually cited any source, because there aren't any with a credible reputation, that would make such a silly claim. If anything the BRICS is fragmented like never before with countries like India and China in very tense competition with each other.