I just re-read the article and, while I still think that it is a firm intention to join, it's less firm than I remembered it being.

The particular parts that make me think it's firm are:

Foreign Minister AK Abdul Momen announced that Bangladesh, along with Saudi Arabia, the United Arab Emirates, and Indonesia, has been invited to join BRICS. These countries are expected to join the group in August during a summit in South Africa.

And:

Bangladesh's decision to join BRICS, which groups Brazil, Russia, India, China and South Africa, with a share of global GDP surpassing that of rich nations' club G7, is seen as a move to diversify foreign relations and currency.

Both these suggest the decision has been made, on both sides, and it's a matter of finalising it.

But, it is not as definite as I remembered it. I suppose we'll have to wait until August to find out.