Not that that entirely excuses the web page from trying some better styles or better yet a "theme chooser" style approach to better illustrate how the base concepts are meant to be design-flexible by maybe actually showing design flexibility in action.
Fluent2 looks to correct many of those sins in a big way, so kudos to Microsoft for course correcting. I like it better than Material.
As far as these cards, they don’t even seem to meet the Fluent1 bar, again they’re more HTML1, and the examples aren’t even great at typographic layout. They built a system that looks theoretically capable of containing good design, but it doesn’t seem they had any designers on staff to actually verify that. It looks like it was built to some abstract spec an engineer and PM came up with on their own.
(Sorry for sounding like a hater but this world deserves better than to have these kinds of low effort designs everywhere, and my guess is with Microsoft’s reach these designs are going to be everywhere)