Yeah, the dust-cap ring that the one-key release crankarm-bolt pushes against is still in the arm.

Easiest way I've found to remove cranks like these is to use some 18" motorcycle tyre-levers. Wedge the straighter end of the levers between crankarm and BB-cup and pry. >POP< comes off in less than 3-5 seconds most of the time. In some rare cases, I have to pry at a spot 180-degrees opposite the first time and by now, 100% of cranks I've tried this on has come off. Ok, so it took 10-seconds total some of the time. But the crank's undamaged and can be re-used as well.