I pay ~600$/month to have a 4 1/2 apartment close to a big-chain supermarket and all necessary amenities. This includes the Hydro bill, the fridge and oven-stove. I have an interior pool. Yes, at that price. Food is about 500$ a month. Internet a further 60$, for a 30/8 Cable pipe.
I'm about 200km from Montreal, close to a university.
He says he lives in a four bedroom four bathroom house. And he says he lives in what he believes to be one of the nicest neighborhoods in Longmont. His wife also states that the house has around 2600 square feet. That means the house is worth at least $200k. I would suggest that it would be worth at least $300k if it was older. You could get a little bit bigger house for $400k though. I wouldn't say that Longmont is an expensive place to live, it is definitely a lot cheaper than its neighbor Boulder, but I would say there are a lot of cheaper places to live.
http://www.mrmoneymustache.com/2011/05/11/the-elephant-in-th...
[1] http://www.mrmoneymustache.com/2012/06/21/i-just-gave-up-400...
So technically the blog money was somewhat covered in the article, though in a way that I agree is likely very misleading.
As a "living frugal guru" you can't exactly come right out and say "Also, I'm making a bunch of money by selling advertising to you all", though it is almost certainly the truth.
Not to mention that you need to somehow figure out how to rent an apartment for three in SF for less then $300 a month.