Earlier quoted context omitted.
If it was applicable to modern war, it would talk about logistics and technology, whereas it talks about merely tactics.
Um, Art of War does indeed cover the importance of logistics and supply. And espionage (from using deception to spies to scouting). And morale (both yours and the enemies). And many other factors. Tech not so much because armies don't generally develop new tech in the field.
See also Alan Turing, or radar (wasn't the carrots and nightvision myth started as misinformation to conceal the perfection of radar technology?)