yeah, actually, that optic you see in pzfahrer is not the MG ZF 'Rundumsfeuer' like we are talking about here, but is actually a ZF 1128. This ZF 1128 is seen a lot in the post-war Swiss G-13s as standard issue.
I think the ZF 1128 was a late-war manufacture. They often show up with the the three-letter codes on them. It was a bit more crudely, cheaper constructed, and many of them ended up after the war being re-used by the Swiss in the G-13s. So there might have been some confusion when the article was written at the time, because I don't think they were in the Stugs, unless somone else can shed light on that.
See Horst Scheibert's "Hetzer (Jagdpanzer 38 (t) und G-13) in the back there is a G-13 section and you'll see the ZF 1128 poking out of the postwar observation dome and also from inside the cabin.
somewhere else on this board I think there is a post on the ZF 1128, I think I put up pictures there, on it.