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The geometry of the suspension is simple, but the explanation isn't. The rear toe does change due to ride height. It is a PIA to install rear camber/toe alignment shims and the slight variation due to the change in ride height has a negligible (if any overall) effect on tire wear. Your rear wheels move up and down when you hit bumps after all and it doesn't kill the tires. I suspect Toyota just changed the specs to match where the alignment ended up geometrically after the drop and called it a day. Easier on the techs in the shop and less labor pay out.
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