Like many I have spent large blocks of time in the wilderness. Once 19 days in the remote swamps camping and hunting away from anything civilized. Never saw any indication of BF. Not very scientific but empirical.
I suspect Les is trying to make a buck(good for him) and is doing whatever he can to keep his ratings, much like all the other BF shows.
It's entertaining so I look at it like that, no more, no less.
IMO it does lessen his credibility in the survivorman category. In fact if BF was as poor at foraging as Les he would long be gone.