That would be my guess. Knowing cars, but not Toyo's specifically, I wonder if you could back off on the adjustment within the ebrake linkage? There might be a nut somewhere that you could loosen to minimize the preload. Given the unusual pedal operated ebrake, I would guess a single cable would go back to a Y where two cables both attach before going to the rotor/drum assy. That might give you enough play to get it off. If it indeed works like I'm guessing it does.I would say it is likely your rear service (i.e. emergency) brake in contact with the drum in the top hat. You have to back it off with the star wheel. If you try to force it off, it will jack up the drum brake and you may not get it off.
Agree that having it straight would provide max clearance but I think the reason that it is not coming off straight is because the service brake shoe is hanging on the one side that is not moving. Really need to find that star wheel on the back side....as I recall, it turns the opposite direction of the wheel on the other side. I have forced the rotor off before by cranking the bolts and banging a heavy hammer on the inside of the rotor on the side where it is hanging. Totally jacked up the rotor (which I was replacing anyway) and the brake shoe mechanism which had to be rebuilt. So It can be done.From your pics it looked like the rotor/drum is not being pulled out evenly by the M8 bolts. The top portion of rotor being too far out compared to the lower half. You'll need to slack off top bolt and align rotor back to be straight on the vertical plan. Then turn bolts ( T & B ) equally, a couple of revolutions at a time, alternating between both bolts to prevent cocking the rotor and jamming it hard against brake shoes hence preventing further outward movement. Hope this will work for you.