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I think our answer is in the note at the end of Rule 9.2.10...
"The thrower may penetrate the plane provided he/she does not touch the inbounds area or a player inbounds before the ball is released on the throw-in pass."
Since said thrower last touched the spot-throw area, therefore is technically still there, then the play is legal.
However, if the thrower touches a player defending the throw-in before releasing the ball, it's illegal.
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