Probably.
If he really arrived at that answer from the "1 Guest" in the AirBnB website then hes' a real tool. "Guest" on the AirBnB website don't refer to visitors to the site. Instead it means "How many people will be booking at a location". Hosts are the people who rent out their homes/apts/etc and Guests are the one who come to stay in the aforementioned abodes. So when it said "1 Guest" in that screen shot, it would be up to the visitor to scroll and change it to the number of people that would staying at a desired location.
Didn't mean to stray from the topic, you thought that someone writing something like he did would have more common sense.
The article was interesting though. I didn't know that the AirBnB venture was worth that much. Thanks for posting it.