I saw that episode recently, and if it's the same one, he didn't start in the jungle, he arrived in a kayak from the sea. He explains his decision ... he was thinking, IIRC, that he could be very near a road or other civilization only a short way through the jungle, but he would never know it. So he decided to risk it, regretted his decision, and came back out to the shore.
As for the ongoing Bear vs Les debate ... I watch both shows and enjoy both of them immensely. I appreciate both shows for what they are.
I actually don't necessarily agree that you learn nothing from Bear and a lot from Les. Bear does give a lot of survial information, and almost always prefaces a risky move with warnings or qualifications ("I'm an experienced climber ...") I've seen a Les show where I learned almost nothing (the arctic one), where he basically failed everything he tried and ended up being lucky enough to meet a native hunter; beyond stripping the snowmobile and making snow-goggles, all he did for the rest of the show was walk and complain about having to film himself walking lol