The Tree of Life spread is the longest layout in this atlas and the only one whose positions come from a diagram with a doctrine attached.
The positions are not the spread's own
The ten positions are the ten sephiroth of the Kabbalistic Tree of Life, in their standard arrangement. That diagram belongs to Jewish mystical tradition, was taken up and reworked by Christian and then occult writers from the Renaissance onward, and reached tarot practice through the nineteenth-century French and English occult revival. The atlas records that history separately.
Using the diagram as a spread means the position meanings are not chosen for card reading at all. They are the attributes of the sephiroth, and a reader laying this spread has committed to a particular reading of them before dealing.
The practical difficulty
Ten positions defined by an abstract scheme are hard to keep distinct in a live reading. Wisdom, understanding and beauty are not obviously different questions to ask of a card, and the two positions most often reported as collapsing into one another are the pair standing for expansion and severity. A reader who cannot state what a position asks before turning its card will not be able to read it afterwards.
The borrowing runs one way
Nothing in Kabbalistic tradition involves cards. This atlas records the spread as a borrowing by tarot from a source that did not offer it.