Thanks for posting the video. I am hoping they do a comparison between the M5CS and M5C. Carwow did a review on a 2021 M5C (posted on 1/15/21). They produced a 0-60 time of 2.9 seconds (21 M5C) on a cold damp road after several attempts.
We need a review like the one that was done by The Grand Tour back in 2019 when they compared the M5 to the Alpina B5. Both vehicle were timed around the track driven by the same driver and as expected the M5 was quicker. I am sure the same thing will happen when comparing the M5CS to the current M5C. I have attached the video and the comparison for the M5 vs Alpina B5 starts at the 7:47 mark.
For your viewing pleasure: