that statement is such bullshit: it implies intelligence is an easily quantifiable and purely genetic trait. What constitutes intelligence? If i know quantum physics but nothing of genetic, how smart I am? If i know both but know nothing of sociology, of politics, of the injustices perpretrated in the world, how dumb does that make me? is it decided by my genetics, or is it the nurture i am shown and i have towards my intellect that grows it?

it's just how capitalism works. Read Capitalist Realism by Mark Fisher if you want to get a better idea of how things got here