I think it was just a joke or a little gift for the summit. As far as I understand, BRICS isn't looking to make a singular currency akin to the Euro or something like that. Ben Norton had a good breakdown of the proposals that have been discussed: https://www.youtube.com/watch?v=3pHr5yzLEHA
The forthcoming blockchain-based BRICS pay system is anticipated to revolutionise international trade. This new system offers an alternative to Western financial infrastructure like SWIFT. By adopting blockchain technology, BRICS countries are poised to enhance transparency and efficiency in cross-border transactions.