If they were truly POW's they wouldn't/couldn't be charged
with murder even though they had killed the enemy in battle.
You are correct. al Qaeda terrorists are not POWs - because they belong to no nation state, do not adhere to any international convention of war, are not known to have a formal leadership heirarchy, and do not wear identifiable uniforms.
Thus they are not by any stretch of the imagination subject to Article 4 of the Geneva Convention relative to the Treatment of Prisoners of War, 12 August 1949.
The Red Cross and Amenesty International are liars and would be easily defeated in any appropriate legal forum on this point.
It is interesting that AI and ICRC are the only organizations making these halfwitted assertions on behalf of al Qaeda.