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.

I’d probably stop talking on this thread if I were you. If your management chain sees this, you’ll have at minimum a conversation about using judgement when speaking in a public forum, at worst, your comments might be used as justification for disciplinary action.

His management has already nudged him to find a new job.

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This was a bit back but not to far back.

Took a significant pay rise. elsewhere and got to work with some other ex atlassian colleagues.

Disparaging your former employer might also be against your employment agreement and doesn’t make you look good either. Just giving a friendly heads up!