My understanding about the article, which makes it interesting to me, is that (according to TFA) a lot of what is generally understood about The Art of War as general strategic concerns applied in very large scales or long timeframes was actually way more
literal than people think. Always according to TFA, when Sun Tzu recommends "attacking allies" he literally means attacking them on the battlefield, because they are more likely to flee --
not undermining alliances prior to a war, as many people understand it. Likewise, when he means "attacking the enemy's strategy" he didn't mean "undermining the long term grand strategy of the enemy" but actually "acting to neutralize the immediate battlefield plan" (as in "if the enemy tries to lay a siege, provoke him into attacking"). Here strategy means "immediate battlefield plan", not "long term nation-wide strategy".
Overall, always according to TFA, Sun Tzu's Art of Way is way more practical and literal, and less "hand-wavey overall strategy" than generally understood. I think I actually like this because it more or less destroys its appropriation by self-help/business gurus. After all, if Sun Tzu is literally talking about killing your enemies while they are crossing the river, it's less useful as a metaphor for startups -- a welcome side-effect.