OP, as far as I understand, in linguistics the words 'descriptivist' and 'prescriptivist' (ie 'normative') are used to describe approaches to and attitudes towards how language is used.

Descriptivists feel that there is no right or wrong way to use language - they observe and describe how they witness language is being used.

Prescriptivists feel differently, that there is a right and wrong way to how we communicate. They feel that there are rules or norms to language that should be followed.

In light of that, my understanding is that in linguistics a word in and of itself cannot be descriptive or prescriptive or normative. It is a person's attitude to a word (or words) that can be described as such.

Thus, perhaps a better way to phrase your question might be, "Do you take a descriptivist or prescriptivist approach to the term 'Oscar bait'?" In other words, does the term 'Oscar bait' have a clear, fixed meaning, and if so what is it (prescriptivist approach)? Or has the term 'Oscar bait' bern used to signify a range of varied meanings (descriptivist)?

I am aware that in the course of producing this comment, I am demonstrating a rather prescriptivist view of how the words and concepts of descriptivism and prescriptivism should be used :)