Ahh, I'm looking at a much more recent case in New Jersey, not this one from 10 years ago. The test you're talking about isn't an IQ test; it's a heavily and obviously culturally-loaded literacy test. The whole point of actual IQ tests is to isolate intellectual aptitude from cultural literacy.
(I'm writing as if I think real IQ tests are a good idea, and they are not --- in fact, that's my whole point: there's a mythology that IQ tests aren't used because they're illegal, but they are not that; what they are is ineffective.)
The efficacy of IQ tests are a separate argument and the general abandonment of IQ tests by corporations as a demonstration of their inefficacy would be more substantive if such tests were not in effect made illegal at the same time. I.e. if IQ testing conferred no possible legal liability then the spontaneous abandonment of their use might be evidence of their ineffectiveness.
(I'm writing as if I think real IQ tests are a good idea, and they are not --- in fact, that's my whole point: there's a mythology that IQ tests aren't used because they're illegal, but they are not that; what they are is ineffective.)