I am puzzled by this. There is also this first order decrease in cost of living that technology drives, that really is the 'rising tide that lifts all boats', in effect, a 'natural' progressive redistribution[0]. It would be hard to argue that inequality increased between, say, 1700 and 1900 because of the increase in technology.

[0] This 'natural' redistribution tends to be counteracted by authorities that debase the money system. Currently we have an explicit anti-deflationist policy on the grounds that lowering prices are believed to inherently have a socially destabilizing effect. Monetary policy tends to be regressive redistribution, because the primary executors of these policies are connected to banks, and the secondary effects are to create upward market indexes that beat inflation (but are eventually corrected downward, hurting middle-class 'slow movers' like pension funds and disproportionately helping upper-class 'fast moving' investment classes).