I wonder if
@Yellow Saddle has a solution
I've been waiting for a photo, and it arrived.
The silver hub certainly looks like it has an offset. That spoke isn't going straight through.
The black one hasn't. Once upon a time, a silly company (perhaps a German man) called Rolf Vector played around with nonsense like this. It was the so-called paired spoke design, where opposing spokes from either side of the hub would arrive at the rim with a small gap between them, say 20mm. This means that in the completed wheel, at the hub, there were two adjacent spokes close together, then a large gap and then two close together again, etc. Those hubs were similar.
I wonder if that isn't what happened here.
Somewhere I have a picture of such a hub transplanted into a standard even-spaced rim. I'll dig it out.
When I still built wheels for a living this type of thing was frequently sent my way because we manufactured our spokes from blanks. Cutting zillions of lengths weren't a problem.
Edit:
No, can't find that photo now. But here's the type of rim I'm talking about.