All Ski Craft are PWCs, but not all PWCs are Ski Craft.
As far as correctness of pictures, the company publishing the booklet uses what they have or what they think looks good. In fact, they may know little or nothing about boating. Their business is publishing books and booklets for many markets. The NH booklet is a massaged version of a boating guide put out by many states. The important thing to remember is that it is a guide, not a law book.
The people you saw who were sent home most likely didn't have any PFDs available. However, correct protocol would have been for MP to lend PFDs to make the craft legal and escort the vessel straight back to shore. That being said, it is unlikely they were "sent home" because there is no authority to terminate a voyage or send someone home and the MP would have the duty of care once the officer realized there were insufficient PFDs on the vessel. An escort to shore would be required.
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