Lord_LuBu, Mastering the Art of War is simply the name of the book in which Zhuge Liang's "The Way of the General" is published. Mastering the Art of War is not a translation of The Art of War, and Zhuge Liang's "commentary" on Sunzi is very general (i.e. it doesn't refer directly to specific passages all that often).
So, yeah, people are just getting some titles mixed up. Mastering the Art of War is a little collection translated by Thomas Cleary, which contains original texts by Zhuge Liang ("The Way of the General") and Liu Ji.
(For what it's worth, the whole of Mastering the Art of War is also published as its own section in a larger edition of The Art of War by the same publisher.)
"If I had to do my life over, I would change every single thing I have done."
— Raymond Douglas Davies, 1967