Good software takes time. Asking a new programming language to have "mature 3rd party libraries" is a bit harsh. You are, of course, correct in that the variety of libraries available in Go is more limited than older languages, but I have hope that it will change rapidly.
I am not asking it to have anything, the article is insulating that GO is the new go to language, it is not because it doesn't have mature and comprehensive libraries. When I make a decision to use a particular language I don't wan't to handicap myself, you need as much edge as possible. In 10 years maybe Go will have a vast array of mature libs but until then I shall be choosing Python and C.