There is a bit of reasoning backwards from conclusions here. For example, you will likely find the applicants rejected numerous times from FAANG have higher ag

There is a bit of reasoning backwards from conclusions here. For example, you will likely find the applicants rejected numerous times from FAANG have higher age-adjusted bodyfat levels and more dental cavities compared to successful candidates. And of course these measures negatively correlate with IQ too. So what? Correlation doesn't necessarily make for reasonable selection criteria. Variance is too high.