Err, no Dave. It actually says:
The TE-1 will be capable of a 0-80% charge in just 20 minutes. If you’d limped into a charging station when you started reading this, the bike would already have added five miles to its range.
So the "5 miles range" refers to how much charge you'd get in the time it takes to read the article, not what you'd get in 20 minutes.