It hasn't ever been this hot, this regularly, especially in the northen parts of the continent. Add that to the number of historical building, streets, etc, that really can't (or shouldn't) get littered with eyesores on every balcony, and you can understand why AC units never picked up much steam in a lot of places. But that doesn't mean people have some twisted aversion to the technology, in fact, it already exists in many places. Where I'm from (a southern country), it's more common for a public place (buildings, transport, and so on) to have AC than to not have it. On people's homes, it's less common, but there's been a natural increase in demand. Unfortunately, many can't justify the investment to retrofit it into existing buildings, though new ones are likely to be built with central HVAC systems.
I don't know, it feels weird to read pieces like this one. It seems clear the author does not live over here and has a skewed conception of what Europe is and the peculiarities of each country and region. His previous post on the topic even goes as far as calling out some form of resistant to "foreign technology"...
It's easy to make blanket assumptions, but a bit of empathy and a more careful approach into these issues would go a long way.