Nice catch! Report it using the link to the form in this post: Video On Demand Info
This service is a bit different than a typical Plex Media Server. It’s not “PMS in the cloud” but does borrow technologies. The categories you mention we refer to them as “hubs.” They include automatically generated and also human curated hubs. We plan on doing a lot more with human-curated hubs.
More ways to browse this catalog are coming I’m a fan of browse by genre.