In American style dance there is no single syllabus, as there is (pretty much) in what we call International style. The particular syllabus reached from the link you posted is the BallroomDancers.com syllabus. The major studios (Fred Astaire, Arthur Murray) have their own syllabi. Standards organizations (USISTD, NDCA) have theirs. DanceVision is another popular syllabus. Of course there are many figures common to several syllabi, but they are not identical. This isn't usually a problem for social dancing, but competitions generally specify which syllabus they require.