Apparently Jebus told him to do it.
Looking at the photos I'd argue it's not a tree house any more tho it may have started as one as it is not in the tree much of it touches the ground. it's more a house with a tree in it rather than a tree house or house in a tree.
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I agree, it's not treehouse, as it blatantly joins to the floor.
Lying hippie bastards...someone should burn it down (that'll teach 'em)