He has it wrong... Maybe so. I often am wrong. The original context of this was that I personally, as a writer, would not use a tired phrase like "wander the earth" without some self-awareness that this was indeed a tired phrase. I would never rule out all un-ironic or "sincere" uses of language in poetry. As for that, there is plenty of "Old Sincerity" still out there. Isn't that what Louise Glück does? There's a solemnity untempered by sensitivity to tone. These people don't listen to themselves. They aren't aware of how they sound.