It isn't click bait. If you click through to the map and look at London, the owners are almost exclusively public sector or tax-evading shell companies in place

It isn't click bait. If you click through to the map and look at London, the owners are almost exclusively public sector or tax-evading shell companies in places like The British Virgin Islands, Panama, Jersey, The Isle Of Man, etc. None of these jurisdictions make company ownership records available, thus they can be considered secretly owned.