It's a pretty big leap to get from "notation isn't required for all forms of music" (what the person you're citing actually said) to "Lilypond is only for you i

It's a pretty big leap to get from "notation isn't required for all forms of music" (what the person you're citing actually said) to "Lilypond is only for you if you're a classical musician". The music world isn't divided into a dichotomy of jazz players and classical players, and even many modern jazz players read and write musical notation.