Since ive never heard of anyone talk about this or seen it ingame. With the addition of Mystic Arts brings another mechanic into the game. You're now able to lowjump while falling in air.
e.e Lowjump isn't hard to do. An you're defining something different, please don't call it "Lowjump" Lowjump is as defined: A double jump that hits off the ground on the second release.
If you mean doing the kg c that can break the falling animation so you can jump mid air then your wrong because low jumping with that fall break is not really new. You can break the fall animation by block dropping which also allows you to low jump mid air too.