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I fixed the issue. The car tries to use the battery as much as possible to save fuel. Alternator isn't being used apart from engine braking (recuperation). When the car eventually has to charge the battery, it will do it in 150A pulses. This causes the idle revs to jump up and down. The engine has hard time keeping up with the 150A alternator load while maintaining steady idle.    I solved this by coding the battery again. I have EFB battery and used EFB coding but this time I chose AGM coding. When I saved the settings, I immediately heard that idle changed. Now there's no more pulsating idle and charging is much more stable. I don't know if the EFB coding in my car is "broken" or if it just doesn't like EFB batteries. Or maybe charging the battery in pulses works faster. To my knowledge, EFB and AGM are pretty similar so I can use AGM coding without damaging the battery. And I really prefer having smooth idle rather than pulsating revs and shaking car.    Even the Skoda authorized service didn't know what caused my rough idle. Fortunately I have my OBD11. I was worried that I might have bad injector or high pressure fuel pump but in the end I only had to change one setting to fix the issue. It took me a while to find the culprit though.

Thanks a lot guys. It seems that it comes with the rear crankshaft seal assembly (036 103 171B) Mystery solved! Ordered the part (FAI brand) for 25€ shipped.

Lots of them are model Y and X as well as S models. 

I have informed the vendor, and he's offered a partial refund. I'm just trying to guage what a fair partial refund would be based on potential cost of repair. I'm not bothered about a perfect repair, but a good quality touch up, if that's even possible with those scratches. 

High end electric cars, and you mention the most popular is a white Tesla. A base spec Model 3 in white (the only no cost option paint colour) is £39,990. That's assuming they were bought new.