They've been gamed in the "study for the test" sense for years—a sort of human over-fitting—but managers did not mind. I've heard some insist that this is a feature, not a bug. (Depending on levels of cynicism, it's either testing for diligent workers who put effort into preparation, or selecting out non-conformists who aren't willing to put up with management bullshit.)

LLMs make it easier to cheat and give managers a push to develop new, AI-aware, assessment methods, but don't really change the underlying organizational dynamics that led to these tests in the first place.