So you're arguing that I shouldn't describe some fictional thing/being as being primitive? Because???
For the record, I think describing human cultures as "primitive" is not very desirable. Given that not many people think of themselves as primitive, the terms is strongly suggestive of the perspective of some other culture that is looking down on the "primitives".There's nothing wrong with the word primitive.
I don't want to say there is no need ever to use this sort of terminology. I teach a theoretical sociology course and use the language of "moderntiy" and "pre-modernity" because something is needed to label and explain eg what happened to East Africa between c the first half of the 20th century and c the second. I think modernity is a more useful because more explanatorily powerful lable than primitive.
But in the context of D&D I don't think the word "primitive" - or similar language - is needed. D&D doesn't need explanatory anthropological/sociological terms. Orcs and gnolls are as technogoligically sophisticated as the typical human or elvish village. (Dwarves are more sophisticated, but they do not provide a benchmark against which humans or elves are described as "primitive".)
For lizardfolk, rather than describing them as primitive it would make more sense to say that they don't practice metallurgy.
The term primitive seems to be deliberately intended to establish a pejorative perspective.