You didn't click all the details? The first section describes it in depth.
The black triangle bullets are expandable, folks, and worth expanding.
They just look like summary bullets.
Why would anyone write an article where the first paragraphs were collapsed anyways...? But then later paragraphs are expanded, so you think that's where the article starts?
This may actually win the award for worst UX I've seen this year. Because it never gives any indication there's any UX at all. Just, wow.