Hmmm, if he's saying that the fan-theory for the blackstaff should explain it, I think that sends me straight back to it being the primary tool of Atropos: She who Ends Life. Prior to the appearance of Hades she was the closest thing to an incarnation of Death we'd seen, and even then the Fates were always above the Gods in most respects (at least in the sense that Fate itself was a Force even the Gods could not contradict).
Perhaps, and I could be goofing my connections cause it's been interpreted a few ways, as Auranos's daughter her mythological precedent is it's HIS scythe used to cut off his ah, danglers. ANd it's in fact, the raven banner, Dagda's staff and other mythological items of similar power.
Honestly though the above woj from Knnn(*thanks btw) and that specific thematic action 'laying of the cattle', is why I originally started to look at it as a placeholder for the power of death, deaths weapon
The left to right motion of reaping the 'grain' was very thematic for me.
Most evidence for this is wrapped up in Baba Yaga, her ability to travel anywhere and her connection to death.