How much he worked has nothing to do with what he is earning - there are people working three jobs out there who barely make ends meet. The page illustrates the absurd level of inequality our society has reached, a level that pure numbers are useless at illutrating.
I can see this working reasonably for text that you can understand without referring to figures, and for texts for which there is external content available that such a conversation could be based on. For a new, say, math paper, without prose interspersed, I’d be surprised if the generated conversation will be worth much. On the other hand, that is a corner case and, personally, I suspect I will be using this for the many texts where all I need is a presentation of the material that is easy to listen to.