The list was drawn up with the UK (especially the availability of, say, biofuels or pure electric vehicles) and the needs of businesses in mind, so don't assume it can be easily transplanted to other locations. I'm kind of surprised to see hydrogen and fuel cells beating modern petrol at this stage of the game, but if anyone can make use of H2 vehicles right now, it's businesses with fleets in traveling around a centralized fueling station.
You can read all of their reasons in the article itself, but here's the cheat sheet.
10. GTL (Gas to Liquid)
7. Modern petrol
6. Hydrogen engine
5. Fuel cell
3. Full electric
2. Modern diesel
How would you rank these technologies?