The text with the 1:12.2 Hockenheim Short lap says this more or less:
The OG M2 had literally the best outside and tarmac temps to deal with, given the 1:12.2
M2C had to deal with very high outside and tarmac temperatures.
He is not exaggerating when he says in ideal temps/ circumstances the M2C would have gone certainly 1s faster around that track.
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FWIW
Cheers
Robin