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Gwern is a person unhealthily obsessed with proving that IQ tests work and cannot be considered a reliable source.

Thank you. But "muh IQ test" lol.

A person willing to spend time and money preparing to succeed in a scenario that exists in real life (pass interviews), is one of the types of persons I want to hire.

This brings us to an interesting dilemma. Do you want to hire people who know the problem domain you're solving --- or people who really badly want to be hired?

We know that cognitive ability has one of the strongest correlations with job performance

There is a good argument that the technical interview success is much more strongly correlated to the number of hours spent practicing Leetcode-type questions than to actual cognitive ability.