The AMD devs must have experimented with injection and test played with the new drivers before release. I wonder why this wasn’t caught by Valve then.
I thought what should have happened was either the dev would get banned, or contacted by Valve and get told they technique should not be used, before driver release, and they could have worked with Valve to fix their code and/or VAC.
Perhaps wait and see what the rumored upcoming 40x0 Super cards will be like.