There's a difference between an X programmer and a developer with programming experience in language X. The former is either incapable, unwilling or not expected to program in anything other than X. The latter has no implied limitations.
In the specific case where X is Go, requiring previous experience is a signal that the company might not be hiring skilled developers. Skilled developers can learn Go quickly because of the language's small size and consistency.
You're right. Most of our guys are using Go for the first time. What I should have said is we use Go at Torbit and we're hiring. If you want to program in Go and work on technology that touches millions of people every day, come join us!
Golang is also a better term, due to the fact that "Go" means a lot of different things and is extraordinarily difficult to search for.