I also don't see the cost of the foundation included... looks like they built on top of an existing concrete slab but didn't add that into the cost. I don't want to rip on them too much, but if they start talking about time and cost (literally as the headline) and they aren't being honest about what it really costs... it's hard to trust anything else about the article.
Can it even be called a "house" without a heater? I mean... they aren't following any sort of industrialized nation building code at all here. No sinks, no bathrooms (can't tell), no insulation in the roof, no smoke alarms... Calling it a "house" and bragging about the time it takes to build and cost... it's moot if it's not really a house. That's all I'm getting at.