I looked at the wikipedia article. It's mostly just arguments by authority. Show me some actual evidence that proves the IQ tests are not valid. I don't think you can.
IQ tests correspond to the success one has in careers, wealth, productivity, less crime, etc. Besides which, the parent was discussing whether companies should hire applicants, and regardless of whether the outcome of the tests is social construct or an innate ability, the point is the same. IQ tests *do* correspond with ability to perform at mental tasks, and racial differences *do* correspond with different IQ levels, so regardless of why that is, it follows then that racial differences would correspond to the ability to perform, and therefore it would be common sense that more people of a certain racial group that performs better at IQ tests on average, would be more highly represented at jobs that require mental skills.
And whether white supremacist groups agree or don't agree does not affect the actual facts. Bringing that up has nothing to do with the statistics, and is muddying the issue. Of course, that was your intent.