I don't see the huge problem. Climb on the pole and take off your bike? Yeah it's inconvenient but somebody double locking your bike with a regular lock is far worse.
If climbing up the pole is as easy as you make it sound, this device is totally pointless.
It's probably easier to climb the pole if there's a lower bike on the pole that you can grab on your way up.
I wonder how much weight the device can support? If you threw a weighted rope around a suspended bike and pulled on it, will you be able to lower it?
But for this if someone has suspended their bike below yours you could never lower your bike.