It claims that they offered to try OBL in an Afghan court. Not that they offered to hand him over to us.
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BFD.
The US would have prosecutors there.
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As for the AUMF, it's the biggest bully on the planet declaring he can invade anywhere at any time to do whatever he wants to.
"EC. 2. AUTHORIZATION FOR USE OF UNITED STATES ARMED FORCES.
(a) IN GENERAL- That the President is authorized to use all necessary and appropriate force against those nations, organizations, or persons he determines planned, authorized, committed, or aided the terrorist attacks that occurred on September 11, 2001, or harbored such organizations or persons, in order to prevent any future acts of international terrorism against the United States by such nations, organizations or persons."
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With the result that 10 Al Queda die, along with 250,000 Afghanis..
Any opposition the invasion by the US encountered would be that of citizens of the invaded country fighting that invasion.
That's pretty much legitimate, as the AUMF is hardly legitimate.
Instead of insurgents, one could term them patriots.