European style houses won't save anyone from extreme heat
Europe has had plenty of fatal heatwaves in the past.
Saudi Arabia has 'proven' whatever it has proven through insane levels of draconian state intervention in everything, a lot of oil rents, and using imported slave labour.
https://www.hrw.org/reports/2008/saudiarabia0708/5.htm
https://en.wikipedia.org/wiki/Foreign_workers_in_Saudi_Arabia?wprov=sfla1
Hardly a model for anyone to follow.
The first one is about how wet bulb temperatures and extreme heat work. The second one is about Europe. Whether or not they are 'more' resilient doesn't matter.
Also I don't think you know what Europe is. Scandinavian, Central European and British houses are mostly made to keep heat in during cold winters. They're not good for heatwaves.
Mediterranean style housing is definitely better for heat. But that doesn't stop Italy, Spain, and France from having deadly heatwaves.