That 45% figure in the article is wrong; Ghana produces about 18% of the world's production.
They hold a lot of the world market because they have low prices. If they raise their price, their market share will drop, and other countries could move in and take their position. There's simple market economics at play.
The major variants of this virus very one of them has been confirmed to be affected by the vaccines. Even in the cases where a vaccine is less effective against a variant, the prevention of serious illness/hospitalization is always near 100%.