You can say it was written in the past. pg and Jessica have written about YC's philosophy multiple times in greater detail over the years. This post just summarizes all of their writing. imo most of the post is still accurate except for one: "by helping founders to start them." I could be wrong, but I feel today's YC is more about helping companies get from seed to series A and beyond instead of just getting started. Not that this is a bad thing, but it's different from old YC. It's also understandable since the former is much harder to scale and building products is much cheaper today.

I think the other big allure for joining YC, aside from the promise of helping you grow, (at least for me) is that it's like a union for startup founders. Unlike other firms, YC won't screw you. In fact, they will fight for you if anyone else attempts to screw you over.