The parent comment isn't saying MMT is true or false. They are just saying MMT is a theory of how the economy operates (descriptive). _If_ you take it as true then here are things you can do (prescriptive).

It's sort of like saying something like the water-sky color theory is descriptive not prescriptive. The theory is that the sky is blue because water is blue and light reflects that color back into the sky. There is no behavioral prescription just a description of how one influences the other. If you want to change the color of the sky change the color of the oceans. That part would be prescriptive. This says nothing of whether the theory is well-founded or how many scientist agree with it.

Parent is saying MMT simply lays out a theory of how a (our) economy currently operates, not whether it's good or bad. People who adhere to the theory would then derive their policy prescriptions based on it being true and (crucially) their desired economic/political/social outcomes.

Your point is well taken, but I think @eggprices was affirming the descriptive validity or truth of MMT by saying:

> [...] if you believe the economy follows MMT (which it does).