I think he will convert to the Treehouse, not foresaking TB, but...
The tree is an area with recent clearing, nearby. It is being end-weight reduced, after Snowmageddon 2019 broke it. Its an old, old remnant Oregon White Oak, which they want to keep. Pretty low risk to the occupied areas. Won't reach the homeowner's house. If it breaks at the crotch, it should miss the neighbor's house.