I personally don't believe a lot of remarkable art came out of any real healthy routines. I think these people were nutty when they made a lot of the stuff. I don't think they had a good sleep schedule or diet, I don't think they controlled their impulses or anything in the realm of don't obsess, don't overthink, don't neglect, and I don't think there was any eat right, sleep right, think right ... at all.
I think they were fucking nuts when the sky hit them.
The advice they give you is for the life they managed afterwards, which you can get from any reasonable person on earth.
But hey, I never wrote anything worth a shit. So, I have no credibility.