Yes i know what he's thinking, but with respect he's talking bollocks! LOL 
He said himself it's taken a year to see the benefits. I started at 14.5 st (not enormous at 5"9', but quite overweight). It took at least two years before my body changed to the shape of a runner, and the same time to become truly comfortable running distance. It's a simple case of body weight/ height.
He has started with the shape of a runner, all he's had to contend with is building some muscle and conditioning it, which a fat person has to do as well as being heavy....
...And of top of that, doing it all with a calorie deficit where they're trying to lose weight.
Really, it' easy to look at the other side of the fence but theres no substitute for living there.
In response to the op, it depends on how you judge fitness and what your standards are. I once read that your not considered moderately fit until you can run a sub 4 hr marathon. I can understand that, there was a world of difference in my fitness when i ran 3.42 compared to 4.30, just as a sub 3hr runner would feel like death if they were me now! LOL
(i feel like death now...)
Edited: 30/12/2010 at 11:02