Under this new explanation, yes the throw is legal. Imagine being on the sideline, feet three feet back and throwing with your outside arm upcourt to a player just inside the sideline 80 feet away. Nothing says this is illegal as long as the throw crosses the plane of the boundary and enters the court.
A cannot receive it until it has crossed the plane (r9-2-3). R9-2-11 says that B may not break the plane until the ball is released on a throw in pass. I would think that if it is spot throw-in, there would be no violation on any touch by B after release. Either A releases without it being a throw in pass (violation on A before plane was broken) or it is a throw in pass and B can break plane.
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