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Mine is English and I generally find myself to be quite knowledgeable about most grammar but this is not one I was familiar with. I even asked other English speakers I live with and they didn’t hear about this rule either. It seems quite outdated at least where I live in terms of common usage
There’s no rule here. Note “usually means” in their comment. This is an ambiguous phrase for which some people have a convention but it’s inherently weak. Anyone writing a headline should have better instincts about usage and style.