With respect to the C8 lap time on the VIR full course, I then looked up on the web the lap time on VIR full course but the only entry came up was the Viper ACR MKV, but it was driven by Ralph Gilles who is not a professional racer.
I then looked the Viper lap time at Laguna Seca driven by Pobst, and it was faster than the 720S, and only one second slower than the McLaren Senna. So comparing the C8 lap time at VIR full course driven by Pobst to the Viper may not be so accurate.
I wished they could have used the same configuration by Car and Driver Lighting Laps so we have a larger sampling data to compare.
Laguna Seca lap times driven by Pobst:
https://fastestlaps.com/tracks/laguna-seca-post-1988
Viper ACR MKV - 1:28:65
911 GT2 RS - 1:28:30
McLaren Senna - 1:27:62