You're right. They are gone! Just checked on my larger iPad screen and they wiped them in latest GO 4 in the Video section.
Replaced with Normal and D-Cinelike only. Then the Landscape, Scenic(?), and some Custom settings only for Video which apply to either the Normal or D-Cinelike setting. Perhaps they think in Custom you will set the three controls under that for whatever.
The Still photo side the various scenes/settings remain, but the Video side has less offerings. I don't use their packaged editor and some of that may have moved there, but don't know. A lot of that prior stuff could be done later while editing with some software so maybe they thought it redundant and simplified it? Maybe something to do with the X7 or Cinecore 2.1 upgrade? That or they botched GO 4 again. Dunno.