First, the tree is a bad choice, it is standing on exposed roots. Second, there is plenty of rope, no need for the sling and carabiners, potential points of failure. Third, the sling isn't around both trunks, he could have done a girth hitch to lengthen the runner, and get it lower on the tree.
Fourth, when you connect the sling around a tree in a basket hitch rather than a girth hitch, you place an additional direction of load on the carabiner, which should only be loaded on the spine.
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