Note that articles should be submitted with the original title:

https://news.ycombinator.com/newsguidelines.html

I also read it like GP and thought this might be a piece about some shady art dealing :)

I think a common way to describe such authors is "anonymous" although that has its own shade of confusion (did they intend to be unnamed?)

I wrote "unknown" because anonymous could be thought of as a donation or someone still alive but anonymous. In this case, it is truly "unknown”

Anyway, mods can edit the title if this causes misunderstandings!