You can argue that the theorems are wrong, or that the explicit assumptions of the theorems don’t hold, which many people have done, but like, there are still coherence theorems, and IMO completeness seems quite reasonable to me and the argument here seems very weak (and I would urge the author to create an actual concrete situation that doesn’t seem very dumb in which a highly intelligence, powerful and economically useful system has non-complete preferences).
If you want to see an example of this, I suggest John’s post here.
If you want to see an example of this, I suggest John’s post here.