Not many schools are going to teach submissions to kids. Our 5-7 class starts some very basic ones a year in... but they don't complete the submission ever. Just get the position and the match ends.
As for the ATA school, sounds like a rotating curriculum. If done well it is a great approach to managing a class of mixed ranks. Which is something pretty much every school is going to have. With usually 10+ belt ranks and a few different age group having multiple ranks rotate through the same material all together and then move up to the next group after hitting each cycle This sort of setup is becoming pretty standard in schools that hit a decent size.