Not convinced. Something's off with their formula. There are dozens of cities with worse jams. This survey says London's only 55th. https://www.cbsnews.com/pictures/worst-traffic-cities-in-the-world/8/
I think "hours of travel time lost" is not a very tractable metric. If you reduced all of London's speed limits to 5 mph congestion would decrease on this basis, despite journey times getting longer (or staying the same in some areas).
@NickCJ started
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Not convinced. Something's off with their formula. There are dozens of cities with worse jams. This survey says London's only 55th. https://www.cbsnews.com/pictures/worst-traffic-cities-in-the-world/8/