I think the "object"-less OO tag is a bit overblown. Structs are objects. Just because Go creators didn't choose to name them that doesn't mean there's a fundamental difference between Go structs and other languages' objects.
There's a good quote in the article about this under 'Inheritance Is Best Left Out' - James Gosling responds to someone asking what he'd change in Java in retrospect - “I’d leave out classes,” he replied.
Right, but that doesn't mean Go is not object oriented, it simply eschews inheritance for composition. Go also offers something else n lieu of inheritance that many other OO languages don't have, embedding.