That’s a lie the best hire straight out of university too. Having worked for meta, Goldman Sachs and Bloomberg I can assure you it’s only a matter of cracking their interviews i.e. leetcode.
Funny enough you learn on a percentage basis their turnover rates are greatly exaggerated, and some years are lower than a “healthy organization” of their size would like.
No job is the best job, but you will learn a lot about tech and software engineering at these places. Doesn’t mean it’s right for everyone. But it is worth having an unbiased view on this.
Having been a senior person at some of those places and other adjacent and FAANG, as well as others, I can assure you those aren’t the best places. But they have good brand.