> Code readability, testing practices, and the types of patterns employed (or really the types of anti-patterns avoided) are more important than the language used

This is very true, but also a bit of a fallacy - in particular for unexperienced developers.

Saying it in the way you did can create the impression that the choice of the language is not important as long as the mentioned properties are taken care of. But it does not mention that these things are not independent of each other. The choice of language has a huge impact on readability, testing and patterns (all else being equal).

I would phrase it the other way around: because code readability, testing practices, etc. are so relevant, it is important to choose a language that makes these things as easy and productive as possible.