Though I respect your opinion, there is a quiet voice telling me that Desi loves to hype Desi and that his survival skills are very similar to legions of hobbyist hunters and hikers.
The fact that Desi's "remote secret spot" appears to be a short mountain bike trail ride from a dirt road only makes the quiet voice louder. Granted, Desi appears to be in good physical condition for his age, Casual hunting, hiking and fishing are great past times.
But... when there is nothing to shoot- or one cant shoot for fear of discovery, and the fish are not biting, one gets very hungry, very fast. Even in semi wet terrain, the act of obtaining water, carrying it and storing it can be harder than it appears.
Improvised fish, crawfish, turtle and crab traps plus baited lines can net in calories- well, at least some of the time- if one can risk being spotted. Good outdoor searchers will know where to look for traps. Edible things can get trapped out fast- or there might just not be a lot to catch to start with. Things then start to go "Hungarian" get it, get it. LOL
Going into history......
Indigenous hunter gatherers from every continent and every time had a general preference for living in groups of 20-30 people. This allowed for division of labor and division of expertise when hunting and gathering. A favorite slow death sentence used by indigenous was banishment. Survival then got very, very hard when needing to do it solo.
Even with a group, hunter gatherers the world over would quickly attest that finding enough food day after day can be tough. And that is when the hunting and gathering is being done by real career pros with out the need to hide from searchers.