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Even the "case with the soldier", what someone is fixating on are news headlines. If you read one article, it says "children he knew".
Making a sexual depiction of a particular minor is illegal, yes. This seems very rare, particularly compared to sexual depictions of a fictional minor.
Of course, chances are that someone doesn't have to go after that specifically, as they're involved in other criminal activity.
Also, legal scholars have written papers fairly recently about how this context matters a lot to a U.S. Court.