First, the selection criteria for the cities covered in the article are completely unclear - for example, there's not a single city in Germany mentioned.
The text itself is also inconsistent. "Four of the top five cities — Bradford, Coventry, Birmingham, and London — are located in the United Kingdom." However, London is on place #15 according to the data presented.
It's probably best to ignore this drivel. Though Bradford felt pretty bad when I was living around the corner in Leeds a decade ago... :)