Everything on the web "uses the platform". There's no other way to get content into the browser.
Web Components are just a part of that platform, and very badly designed at that. A lot of the platform around them now exists only to patch holes in them (like form participation) and to solve the problems they introduced.
And since they are now a part of the platform, they poison everything like upcoming CSS scoping which instead of being a straightforward thing now has to account for all the web component insanity.
Edit. There also so many thing wrong in the article that argh.
"We don't need React and dependencies"... and then talks about lit-html which is a small framework with custom syntax and constraints on how you can use tagged literals.
"Easily replaceable dependencies"... and again talks about lit-html which is a fully incompatible replacement for Polymer. I wonder how folks that used polymer (Youtube) feel about "easy replacements".
"Can't control rendering with React" and talks about Web Components which literally give you no control over when a component can be rendered, don't have lazy loading, cannot subclass SVG or embed partial SVG etc.
And so on and so on...