Contains just the surface level information like pick a CRM, regular updates to your superiors etc. Also this post is marketing for their own customer onboarding product (Arrow).
There's tons of useful information (fully available on the website, no need to download) for anybody who's building / working with a customer success team for the first time, which is much of the audience on HN.
And yes, our "marketing" is trying to be generous with our knowledge and experience. That doesn't mean it isn't useful.