This is an example of ellipsis, a common feature in informal English and news headlines. It's also an example of pragmatics, specifically a conversational impl

This is an example of ellipsis, a common feature in informal English and news headlines. It's also an example of pragmatics, specifically a conversational implicature, where the omission is forcing the reader to rely on the context of the sentence to fill in the blank or derive the meaning. So while you are correct about the grammar, language use is often more complicated in practice.