The author notes that his article is a "starting point" not a compendium. I like the guy's attitude in this article, although I disagree with some of his recommendations (mileage may vary), but he fails to mention the principle "survival" question, which is first and foremost not "how?" but "where and with who?".
A well-intentioned "prepper" fleeing TEOTWAWKI in some city is just fodder for some out-lying community's roadblock. The "not in my lifeboat" sentiment will rule the day and few will take the time to ascertain your good intentions, or even more importantly your skills and what you bring to the post-disaster party that can benefit the families of the men behind the guns at the community roadblock. Having been undoubtedly victimized by other less principled refugees before you get there, they will be in no mood for negotiation and, depending upon the expected length of the societal breakdown, will have little Christian charity left in them of the sort that commands that they take food out of the mouths of their children and give it to a stranger.
So, the first question is "Got resilient community?" Then the second question is "Got militia?" Answer those two and you won't have to bugout anywhere.
But, that said, I welcome the discussion on this praxis article.