Not intentionally. Just trying to give a more up to date figure and a source for it.

That's still less than 1/5th of an acre even if you waste all that space for no reason. Keep in mind, Jeavons is trying to sell books and speaking engagements for his gimmick, not trying to be efficient. I grow much more than 4000 square feet of crops and I use zero square feet for storage and less than 1/10th of the growing space in paths.