I just reread the article and still not convinced it's a definite joining.

Momen said the BRICS Bank had invited Bangladesh as a guest, adding that in the future it would invite Bangladesh to join in.

and

BRICS, which stands for Brazil, Russia, India, China, and South Africa, is actively considering its first enlargement in over a decade.

and

Countries such as Bangladesh, Saudi Arabia, the United Arab Emirates, and Indonesia are making progress toward joining the bloc.

Bangladesh is definitely invited to the summit in South Africa in August. But for the rest of it all I can say is it seems Bangladesh and BRICS are aligning towards each other. The goal of this alignment could be Bangladesh joining but countries are very deceitful on the international stage.

This could be posturing by either side for a variety of goals. Such as trying to get a lesser agreement by starting with with a large proposal and walking back slowly in negotiations, attempting to get concessions from a third party by threatening to take an action they dont like, shaping perception the relationship between the countriesnor something subtle and not as obvious.

Overall my opinion is countries do a lot of posturing and talk with no intention of actually following through. Until I see actual concrete action towards a goal I'm not going to trust countries to state their goals.