Most of these “inequality” talking points and “theories” are pure bullsh*t.
That's one of the points the authors make, without diving into the politics of the haves vs the have-nots, race, sex, etc. They back it up with numbers that show the talking points of SJWs and the leftists/socialists are at best misleading, and more accurately, lies (or as you put it, bullsh*t).
I think middle class people need to see this. It publicly answers the questions they have about unemployed people they see shopping in the same stores they do, driving the same cars, wearing the same clothes and eating at the same restaurants. Yet Elizabeth Warren and her ilk still call them "poor", and they want you to pay more, more, more.