It's not YC's job to teach executives anything. Their entire model is self-service: they give founders access to people who know this stuff, but you have to ask for help to receive it. At the same time, a lot of these founders don't know what they don't know, so IMO this blog post is a way of saying to current and prospective founders "Hey, you need to be careful about this because creative accounting is often illegal". The startup mindset is to find creative solutions to problems, but that doesn't work in finance/accounting.

> I mean, the whole model of YC is to take kids straight out of college

Isn't the average age of YC founders closer to 30?