You seem to be saying there's a high threshold for extreme opinions to be published in the Guardian, so the fact that someone wrote such an article suggests that there is a genuine problem that needs to be taken seriously. Guardian writers do not live inside a "bubble" and therefore, there is inherent merit to what they write.

I wonder how often you actually read the Guardian, which is famous for having wildly extreme opinion pieces, especially lately. It's basically the Breitbart of the left, a more or less constant stream of clickbait designed to make people angry and upset.

Just a few random headlines I got from clicking around just now:

"Who paid for the leave vote? Brexit should be halted until we know"

"The car has a chokehold on Britain. It’s time to free ourselves: Our insanely inefficient transport system is in thrall to the metal god. Electric vehicles are not the answer"

"Ask Hadley: Why do older people hate millennials so much?"

"Men on the left are sexist. Labour needs to do more to fix it."

"Feminists don't hate men. But it wouldn't matter if we did."

... and in case you think asking the government to take control of internet companies is new idea from Guardian writers:

"The Guardian view on censoring the internet: necessary, but not easy"

"Internet regulation: is it time to rein in the tech giants?"

"The EU is right to take on Facebook, but mere fines don’t protect us from tech giants"

I wouldn't exactly claim the Guardian floats above bubbles and groupthinks.