Those claims are debatable and often true, not always true. As opposed to straw men which aren't even debatable.
I've seen less actual 10* engineers and more high-functioning individualistic coders who maintain whole systems on their own, and at some point leave the company (most people change jobs at some point, but in their case it was accompanied by "nobody understands what I do" noises) whereupon it's unmaintainable (in one case, running on their dev machine against explicit instruction with no source or login details).
Your company may hit the jackpot and hire a budding Linus Torvalds or John Carmack, but the odds are bad and the guy who thinks he's a rockstar is more likely to be a good coder, but an egotistical person. Lots of actual musician rockstars are assholes too.
A well-functioning team is a much better bet. Lottery tickets are a poor investment.
I know that trading desks may disagree, but IMHO that's a defect of the stock-market gambling culture that they come from (where someone's guaranteed to beat the market this year. Find them and call them a genius!). I've worked in various tech companies, and that mindset is not universal there. It's not even welcome to me.