Ask HN: Why doesn't Google punish medium?

In a lot of searches, one of the first results is a article written in medium. In my opinion, most of them are pretty bad and I barely click on them.

One example is googling "how to find startup ideas" first result is some medium article. I don't want to attack this guy that much, but he has I think 30 followers on Twitter, he is not well known in a startup world and his article is very generic rehash of the stuff you can learn elsewhere. Nothing new that should give him the top stop.

On the fifth place you have a classic PG essay. Below him you have Andrew Chan article. Both people are well known, their essays are read by a lot of people and are insightful.

But somehow one random guy with one article can rank higher. Is it because of medium page authority? Why isn't google doing anything to fix this?