There's no Language Academy in the Anglo-Saxon world to decree what people "should say". Which sounds awful to my ear as the reference is to people. It's is a typo.
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Couple is a collective noun. In American English, collective nouns tend to be treated as singular. This is not always the case in the UK. It is safe to say that, in American English, one must decide whether said couple is considered as a united entity (already wed) or not. Example: The couple are to be married on the fif