The Temple was designed to be counterbalanced so it does not need outer support on the branches. The trunk is very much larger than a traditional tree trunk for a tree of its height which hides the structures that connect the parts together as well as providing a substantial base.
During the event, the Temple will likely be further anchored anyway—no sense making things unnecessarily risky. The day of the burn, all of the tethers will be removed as it is balanced and free-standing. Wind may be an issue, but then it would be possible to retain the tethers on the windward side.
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