1. It assumes a freefall distance rather than attempting to scale and one that is less than a tenth of Coco's height...I would think it would be necessary to actually scale based on the body.
2. The distance he uses is not angsized and appears to be from
some range calc he made earlier, which, by itself, doesn't have a working picture and/or is inapplicable to the calc because range doesn't necessarily correspond to free fall time frame.
So yea, very iffy