The Go developers provided their definition, which is something people conveniently ignore whenever they try to be clever about Go not being a systems programming language.

To be fair, if I repurpose a term that is widely used in one way to mean something else, the confusion that ensues is kind of my fault.

So many places I worked had systems engineering department and none of them had anything to do with operating systems/ device drivers. I wonder whether it has to do with OS hackers hanging on internet together and deciding what systems would mean.

There was no repurposing, as the context was exactly explained. Only later, the detractors decontextualized the Go team's original statements.