since when is "confusion and speculation" an indicator of quality/goodness? if I ran around naked in traffic it would also cause confusion and speculation.

This is a terrible analogy.

It's quite clear that the author means AI writing is now good enough to cause confusion and speculation as to whether a given piece of writing was human-authored.

The confusion and speculation caused by your nude transit adventure is about what the hell you're doing and why.

I think he's talking about it more in the sense that there will be speculation about the provenance of some work.

For example, if desktop fabrication tools get cheap and good enough, maybe one day garage tinkerers will be making Patek knock offs that an expert with a loupe, spectrometer, and a lot of time can't definitively say that any particular watch made after 2034 (to pick a date) is genuine. That would cause a lot of confusion and speculation in the market for used watches.

I think that's what his crypto bros comment was all about (aside from being a joke). Maybe crypto tech could provide evidence to support provenance claims?

You're misunderstanding ... that's not at all the claim. Confusion and speculation is a consequence, not an indicator. Running around naked in traffic might well cause confusion and speculation, but it wouldn't cause anyone to confuse you with an automobile or result in speculation that are one.

At least AI is better at reading than are most people.