I'm appalled that such a quote could be used to support such an argument. Grandparent, and Pratchett's Death, agree that humans and human society are supposed to support humans. Grandparent maintains, quite correctly, that our current society is, in fact, tooled to support abstract concepts like "valuation" and "wealth creation" instead of things like clean nutritive food and safe affordable shelter and supportable realistic hope -- and the biosphere itself that serves as backdrop, stage, and audience all in one.
Whether unintentionally or otherwise, the parent is missing the point. The grandparent doesn't argue against abstraction itself, but the reification of corporations as people, the conflation of the stock market as barometer of the economy, and enablers of all this in ostensibly benevolent governments.
If one chose the read the rest of the fucking book, one would see that it's all about fighting against those who would use human frailties -- like greed, and desperation, and the smallness of our own perspective -- to trick humans into destroying that which makes life worth living. Of course, it's all couched in the supernatural trappings of the Discworld, but as Prachett points out in several Discworld book intros, the Disc is a "world and mirror of worlds". On Earth, the antagonistic Auditors have names and addresses...