If uploads can gather vast new resources by Dysoning the sun using current or near future technology, this calls into question Robin's model that standard current economic assumptions can be extended to an uploads world.
So far as I can see, you haven't demonstrated this or even made an argument to this end yet. It seems to me that basic economics still applies if there is a dyson sphere. There would still be scarce resources, the direction of the slope of the supply and demand curves wouldn't change, etc.
Basic economics won't change, but Robin's model assumes a relatively fixed society/economy across the transition (and Robin's model is pitched as temporary, before changes get too great. The Dyson argument implies changes may get too great, immediately)
In a previous post (and the attendant paper and talks) I mentioned how easy it is to build a Dyson sphere around the sun (and start universal colonisation), given decent automation.
Decent automation includes, of course, the copyable uploads that form the basis of Robin Hanson's upload economics model. If uploads can gather vast new resources by Dysoning the sun using current or near future technology, this calls into question Robin's model that standard current economic assumptions can be extended to an uploads world.
And Dysoning the sun is just one way uploads could be completely transformative. There are certainly other ways, that we cannot yet begin to imagine, that uploads could radically transform human society in short order, making all our continuity assumptions and our current models moot. It would be worth investigating these ways, keeping in mind that we will likely miss some important ones.
Against this, though, is the general unforeseen friction argument. Uploads may be radically transformative, but probably on longer timescales than we'd expect.