Hey Sour D, I thought the Koot you were referring to back a page was the well known organic canna gardener Clackamas Coot, not the guy in the vid, sorry.
I wouldn't put coco into your organic soil mix, especially at the bottom. Coco grabs onto too many ions and will eventually cause you problems. Since you won't be flushing or over watering from the top, its hard to get rid of the extra ions. If you want to try coco for organic soil gardening, I would definitely follow someone's established tech and recipe TO A 'T'. I have seen a lot of failures over the years where folks try and just sub in some coco for peat in their recipes.
cheers
os