Mmm you seem to be right, the injection part itself does work though, just make a few changes and click inject, then refresh from driver, (the dropdown box values are the ones loaded from the vbios inside the memory), if you click refresh button the tool will load the values from the driver directly.
So if you injected something, it will load those.

However, i use to be able to crash my GPU but not anymore, AMD changed something. Guess i will need to contact customer support