Everything written there assumes that the ninjallbow users are at 10 times Wyzdom's level of micro, they have more troops compared to the giant masser, and that their troops are more powerful than they should be.
When did I assume that? Like I said, I'm fairly sure a shinobi running battle would be a much more effective way of fighting, but even if it comes to an engagement, they *could* just snipe all the merics and magikills first leaving the giants. I don't know what would win then, but shinobi fixate could do some magic.