I'm not really familiar with Arabian archaeology (never been my area), but my initial guess on only the image is that it looks like a hunting funnel/pen (often called 'kites'). I have absolutely no idea whether that's accurate and someone who's actually done groundwork there would have a better idea.
Also worth noting that kites are a separate phenomenon from the mustatil the article is about.
I am familiar with kites though it was more in the context of fish traps. I had seen some ancient examples in other places out on the west coast of the US and had read of their use by Native Americans in rivers and bays to catch fish sustainably.
While rafting out in the western US a few years back I built one on the river from memory using driftwood poles, rocks carefully positioned, etc to funnel fish into the shallow water. I didn't catch anything but, like fishing with any form of fishing pole, that really wasn't the point.
I'm not an archaeologist though I have followed discoveries for years and it all interests me. I love history. I do get annoyed when something new is discovered and the same narratives are applied to make it appear that the people were somehow less sophisticated than ourselves. They made do with the things at hand and had a better grasp of local resources and how to use them sustainably than we will. Or maybe they didn't and we keep repeating the same mistakes they made to the point where it is a genetic defect among humans by now.
Also worth noting that kites are a separate phenomenon from the mustatil the article is about.