It doesn't seem like AMD has any intention of continuing to develop this project. The reason it went open source in the first place is that AMD stopped funding this project. The dev and AMD had an agreement that he could open source the code once they stop working together. They stopped working together because AMD wanted out of a project that would benefit its products, and that was demonstrated to work well. The dev opened sourced the project as agreed. This was back in Feb this year.
Now AMD are trying to make the source code closed so no one can access it. They are not announcing a closed sourced version of this feature that they are developing themselves as far as I know. So this move is simply to remove code from the Internet that would allow their cards to work better in certain workloads when compared to their competitors. AMD should not have an incentive to do this. Nvidia has an incentive to get rid of this code, yes.
The implication is that AMD is doing this because they don't want to truly compete with Nvidia. And they don't want to compete with Nvidia because their CEO's don't really want to compete. This is not the first time AMD has simply chosen not to put pressure on Nvidia with AMD seemingly comfortable with their place.
20p per £1. i.e. 20% flat tax rate on all taxable income