They really do a lot to correct for bias, but is it enough?

I would suspect that a prosperous and thereby complex economy also has more resource to discover or document inscriptions. While they talk about researcher bias, they do not really mitigate this.

And yes, I searched the article and the extensive additional material.

Still a valuable contribution.

I’d argue that a complex economy in a failing society is actually a sign of weakness. Lots of nobles and the likes wanting their cut of a pie that doesn’t really exist anymore. So all of that complexity is not really backed up by the reality and you just have a bubble. I can imagine all kinds of roles and professions that just exist to endow people. This also happens a lot in modern society.

I know this wasn’t actually your point but I just wanted to add.