I am guessing (and I can only guess what this guy is talking about half of the time since he makes no sense) He is talking about anyone who wants to join, or wants to do business with them.
So you may not even be a BRICS country, just have a trade deal with them, and you still get 10% more, which is absolutely childish and unreal of course, that won't happen. But the reality is simple, dude is a child, with a brain that isn't developed, hence why he won the USA elections, because a lot of voters are similar to him.
I have seen people in the USA who failed to say 3 cities from Europe, the educational system failed them, they walk around without any proper knowledge, their top scientists are great of course, and people who go to Harvard and yale and other ivy league schools are great of course, there is no denying that, but 90% of the population says stuff like "capital of France is Italy", so obviously they got a president like trump because of it.