I'm skeptical that there isn't another side of this story or at least less absolute terms used.

For example, maybe there's a push against everyone using all their own favourites everywhere. I can see a strong argument for, "please stop writing in Foo. We use Java, Go, Python, and C++. Pick the right one of those for the job at hand. We all benefit from using a common set of tools."

I'm not denying what you're saying. Just feeling a healthy skepticism that they "ban" languagues without a good faith objective.