I have watched the vid nowI don't know if you've watched the video I posted , but it would seem there's not much chance of fixing it. Who knows, the guy on the video is a bike mechanic. The video stops without resolve and in the comments section he mentions. The parts could not be found and he had to buy a new motor.
I don't know if the clutch is in the planetary gears or in the motor.
There's certainly no easy fix, at least not if I'm doing the fixing. If anything it's a learning experience.
If you still want to strip down for parts/experience? you will need beefy screwdrivers to pop the assembly off as well as the confidence to apply the required oomph as per the vid

however in my limited experience such tools are never a good fit and always result in a scraped knuckle or more this end