Regarding the lap time and the car used: IMO, the lap time is no fake, but the car was not the one which will be delivered to customers:
If you pause the video and zoom on the bottom right on board camera with the cockpit view in the video, you will see that the car seems to have been emptied of carpets and so on.
I even doubt if there was a passenger seat mounted based on the cockpit view of the onboard video.
So, for me, regular tyres as stated by Lambo, probably regular engine and chassis set up, but lighter car. That's all.
At the end, if my theory is right, it means the car as delivered to customers would do the Ring in about 7.00-7.05 which makes the Performante still one of the fastest cars ever on the Ring and it is a bargain for 232K€ base price in Germany incl. VAT.
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991 GT3 RS / Gone: Cayman GT4, 997.2 GT3 RS 3.8, 997.2 GT3, Lotus Exige S, 964 Turbo 3.3