Just like San Francisco and Dallas/Texas (from his article) are very different in the US, we should expect lot of differences in Europe (as others mentioned, he clubs UK with EU). Housing is a general problem for all major cities though, not sure why you think it is unique to London in the whole continent. Stockholm, Paris, Dublin, Lisbon to name a few, are pretty bad for housing in their own unique ways. Certainly shouldn't be "breaking your brain".

> Just like San Francisco and Dallas/Texas (from his article) are very different in the US, we should expect lot of differences in Europe

Dallas and San Francisco are both English speaking cities with a shared recent history of being part of the same nation. Most cities in Europe are as close as New York and Mexico City - Dallas and San Francisco is probably more analogous to Milan and Naples (different cultures, different histories, but now speak the same language and are part of the same nation).