Actually, by my count it would be 30 to 40 forms. Some of the stuff that Sin The claimed to make up was taught independantly in Indonesia (the videos that were removed confirmed that). So you look at all the SD material that is unique to SD and cross reference it with what Hiang The is teaching and that's a pretty good indicator of the unique SD material. Add some of the other material that we know came from Indonesia (Buddha Fist, Ground Dragon, 14th and 15th Crane) and that's a list of material that I feel fairly confident is unique to SD.
All the stuff that is taught elsewhere: taiji, bagua, xingyi, hua, the identifiable mantis forms, etc., then that could have been pilfered from other sources or some of that material could have been taught in Indonesia (will will never know which is which).
so where did the monkey beaks come from? Indonesia?
Hung Sing Boyz, we gottit on lock down
when he's around quick to ground and pound a clown
Bruh we thought you knew better
when it comes to head huntin, ain't no one can do it better