Nope, I was wrong and misunderstood the attack. (like most people) They would likely make the attack easier to accomplish, rather than less.

Unfortunately there's very little we can do to defeat this attack, other than have miners use strategies that aren't strictly economically rational in the short term for them. In practice a sufficient amount of miners may be willing to do this, but if they aren't we're going to need better countermeasures than that.