How do they pass off the other 18 teams that didn't win the league and athe least two that were relegated with Prozone?
The article is a bit stupid and reads like a barely concealed advertisement - there's no silver bullet in football; not stats, not a manager, not money. There are unpredictable things outside of your club that no technology or methodology can control for.
However on the extreme other end, glibly dismissing the use of statistics altogether with the "they don't tell the full story" or "you can twist stats to make them say whatever you want" chestnuts is equally stupid.
It's only as useful as capabilities of the people who are making decisions based on it.