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the headline would be clearer with punctuation re-added before the word 'not' to reflect the author's sarcasm

Or get of it completely? It is only used by a "narrow" sub-culture group in the USA, as far as I know.

It is only used by a "narrow" sub-culture group in the USA, as far as I know.

The way we learn about the world is to be exposed to "narrow" sub-culture groups in various countries.

In language, "familiar with" is a vast superset of "used by", and only the former is required for clear writing.