You should read the first sentence in the page you linked. To make matters even worse, none of the "weak" notions even apply to Go, and I thought you were talking about something entirely different altogether given that Go is by zero definitions, colloquial or not, "weakly typed".
The post that set this off called Go's type system "weak". They were not saying that it was weakly typed.
Now whether Go's type system actually has the property of 'weak'ness is very debatable. But whether it is true or false, it remains a factual statement.
[1]: http://en.wikipedia.org/wiki/Strong_and_weak_typing