If I am drunk, or have brain damage, my ideas will be bad and so is my writing.

It’s not about what makes writing good. It’s about what makes it bad. People don’t agree on good writing.

I think Paul is talking more about not bad writing. Otherwise, he’d be talking about poetry, which also asserts truth and style as inseparable. People disagree about poetry. Most people agree Paul is a good (not bad) writer, not a poet.