Looks like the "human loaders are just as fast as auto loaders" is finally over. It seems like the Type 10 has two settings similar to the Leclerc's "Doublement" mode.
Looking at patents for the auto loader system Japan uses, the next round seems to drop off the ammo belt onto a feed ramp. my best guess for how the 1.6 seconds is achieved is a button is pressed where immediately after the first round is loaded, a next round is dropped off and prepared. As a result you get a faster overall reload, but lose the ability to switch ammo type in between shots. Otherwise you get a standar