It is certainly political: "the countries non aligned in the "cold war", currently hindered, will demand a political weight". Why have you quoted me omitting «that will demand a better position»? The whole idea from Sauvy cannot prescind from the parallel from the "Tiers Etat": third as in a different thing politically, third like that large class of poor that demand to emerge. Technically, defined as "the non aligned, the other thing", practically, "something with an historic role important in the conflict and about to explode".
In context of these branches: the academician who introduced the concept did not imply any "superiority" of other parts or other lowly characterization. Obviously disadvantages are noted as they are objective - just like we do when we deal with the world with duly detached analysis. None of them can be translated to vile gut understanding. If the academician introduces a concept of "someidea" and beasts misuse it, if you want to discuss the world remain on the "someidea", if you instead want to be an ethologist focus on the misuse.
If some proponent notices a relevance of some phenomenon to the "someidea", those who noted a "Ah, like the beasts intended" commit a grave base failure in the mandate from the guidelines here to responding to the most plausible interpretation and assuming good faith.