These policies are in place because companies have learned that journalists will happily take any comment, from any employee, from any context, and make it Crucial Evidence(TM) of impropriety...
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Like with the police, there's a lot of hagiography that paints journalists as the dogged researcher who will stop at nothing to expose the truth about $SUBJECT, but like with the police that trope is not the full picture. The average journalist spends a few hours collecting quotes to support a story that they have already written in their head, which they then put into writing underneath the most exciting headline they (or their editor) can imagine. They're paid to sell papers/get clicks, not to discover the truth, and it shows.
With that in mind, OP is absolutely correct, and "don't talk to journalists" should be right up there with "don't talk to the police" in our guidelines for life. They're not your friend: they will destroy you if they think it'll grab enough attention.