Interesting. The site owner's description in the top sticky appears to make the distinction as well, and seems to identify "cruiser" as the general category:
Welcome to the Beach Cruisers Forum
Like the sign say, welcome! If yiu love the old classic look of a cruiser or a beach bike, and love those fat balloon tires and the retro look and feel of a cruiser, then welcome to your new home. This is for everything "Cruiser". Whether you ride a classic old CCM oe Schwinn, or a JC Higgiins, or a modern beach cruiser bike, we want to make this a fun and informative source for all your needs.