I've always been dubious of the whole stick structure concept. I've had a hard time trying to figure out why they would take the time to do them. I have noticed that many of these structures do occur near game trails, so it's possible they are markers. Again, I'm dubious.
For the ones that are obviously not natural, there is always the explanation they were built by humans. Here is an example of one that is not natural along with the assessment.
http://sasquatchresearchers.org/minnesota-river-valley-tee-pee/
From your link:
I cannot rule out that this one could have been built by people.
Of course you can't rule it out because that's who built it, people. Jesus Christ, isn't it obvious who built this and why?
Hint: It's near a game trail.