But psychologists and neuroscientists don't restrict themselves to 'standard IQ' tests when doing serious research. They are aware of all the strengths, limitations and cultural biases of a whole battery of tests.
Average intelligence of ethnic groups of humans varies. It is measurable. A significant part of the difference is genetic.
None of these well-established - if inconvenient - facts provides any reason to make a judgement about any individual within a group or to treat anybody without dignity or respect.
Molineux is a Libertarian - IMO one step away from psychopath.