If you happen to be in YC’s good graces, they will reward you in ways described in the article. If you’re not, they won’t take the time.
I was in YC in 2012 (2 yrs after the founder writing this article, and one of the last years PG was directly involved). By that time it was clear that YC had turned into a “spray and pray” accelerator, meaning they started favoring volume of investments over everything else.
When they did that, it also required that they split their attention between more companies, which inevitably meant that the sort of anecdotes described in the article still happen, but only for companies YC likes and believes in post-accelerator. YC definitely discriminates from that perspective- they choose which startups they think have the most promise during any given batch, and they give those founders preferential treatment.
Which is to be expected. How else can you scale an accelerator?