What part of the article did you read as "Go is a silver bullet? I read it as a list of articles about people/companies who are switching to Go with each giving their reasons for adoption.
No part in particular - I don't disagree with Zef or the people he quotes. But the entire article does have this "look, all these smart and influential people are ditching $THING for Go, you should too!" feel to it. They're ditching stuff for Go for the particular kinds of problems that Go is good at. This is a subtle but important distinction that Zef isn't making, so I figured it was a useful addition to the debate.
"We are still staying with Python"
"Clojure still works great"
"Erlang backend still runs after 10 years"
"Node.js router still runs ok"
Those don't make compelling HN front page article. So if you read HN the impression is everyone and their grandmother is switching to <LatestFad>