Exactly, the whole premise of the article is a bit of a strawman. In fact, where I live, the demand for AC installation is so high that you have to wait months for a company to install a unit for you.
These extreme heat waves are a fairly new phenomenon, summers in central Europe just didn't use to get so hot for such a long stretch of time even a few decades ago. Now that they've become the way they are, people are doing what? Correct, installing AC units. Imagine that.
But let's not forget that energy is also on average a lot more expensive in Europe than in the US. The cost plus environmental concerns, which seem to fair less high in the public conscience on the other side of the Atlantic, have also been reasons why people were not keen on AC units in the past.