The article itself was a bit disappointing because it focused on political issues. In my opinion the strength of HN in this regard is that it is both a "sjw cesspool" and a "haven for alt-right", as evidenced by the fact that a comment on a controversial topic can easily float near zero points while raking in both upvotes and downvotes. And even those who refer to it as "the orange site" still come back and comment. In other words, HN may be an echo chamber but it is a pretty big one with a lot of voices in it.
For example, a rather good article explaining Bill Gates and Warren Buffet's concerns about cryptocurrency was removed.
Remember, Bill Gates is an excellent software engineer; and both Bill Gates and Warren Buffet know a thing or two about economics.
Users themselves get tired of bitcoin flogging and bitcoin bashing, over and over again. Variety is the spice of life.