You have to remove the wheel bearings, just like on the older rear-wheel-drive cars' front wheels. The rear drum and hub are indeed two separate pieces, but they are held together by the splines on the wheel studs. Those studs are pressed in and hold the hub and drum together tight enough to allow the drum to be machined on the brake lathe that way.
Once the axle nut is removed, wrap the edge of the drum to bounce the outer bearing into your hand, or at least push it out far enough that you can grab it. At that point it is fairly common for the drum to refuse to come off due to a ring of rust build-up on the edge of the braking surface. You may need the help of a small pry bar to convince the drum to come off. As you work at it, that rust will gradually break off, then the drum can be forced off.
Monday, June 29th, 2020 AT 6:35 PM