Did you read the first two sentences of that post, or the other 3 examples in the thread I linked to? It's like you read the first 10 words, then skipped over the rest and went straight to Snickers. That's why I said Snickers/peanuts were not the point. The point was that it doesn't really matter what you eat because if you're eating the kinds of large quantities that long distance hikers eat, you'll get tremendous amounts of protein. It could be Snickers, rice, moths, oatmeal, bark, etc. Unless it's something utterly ridiculous like pure honey or Lemon Drops, you're going to get lots of protein.
The mistake lots of people make is they supplement with protein without actually counting the macronutrients in their diet to see if they need protein supplementation. It's a waste of money, pack weight and space. Add protein in real food, food that you're only eating because you want to eat it, not because you want to hit some level of protein that you don't know because you haven't done the math. In fact, if you review some of my old threads, I say that I do add protein powder to my meal replacement shakes, but ONLY because of the flavoring and sweetener in the protein, NOT because I needed more protein.
I'm all about bars if that's an easy form of food to eat, but strongly believe its macronutrients should lean heavily towards carbohydrates and fats/oils instead of protein for the reasons I've stated. If you're eating enough, you won't need to try to get enough protein, but you'll almost certainly not be getting enough carbs and fats. So why supplement something you have more than enough of instead of focusing on something you will need more of?