I'm curious about your choice of title, given that the article goes in a very different direction (and is excerpted from a book whose title literally draws the opposite conclusion).
But more broadly, I think this is a good intro to the idea, and is actually a good defense of mindfulness and meditation generally. It seems like most of the criticisms boil down to some folks' practice not being traditional enough (which isn't really a valid criticism on its own), or that there are other ways to do the same thing. I like that the author doesn't dispute this last. The whole point is that mediation is one tool among many, and like with most things involving the mind, it'll work differently for different people.
Incidentally, if anyone's interested in the topic, I cannot recommend this book enough. It's the first time Zen has ever made sense to me, and is something I find myself returning to regularly.