If they have found a loophole, it would most probably be in the design of the conrod. They may have designed the conrod to stretch under temperature to increase the compression from 16:01 to 18:1....
Armstrong went off in his test... https://www.instagram.com/reel/DTXYTboCL9c/?igsh=NWR6OXJydTJ1N2Mz https://www.instagram.com/reel/DTXgi0nDYVe/?igsh=MWdqdjFnaGFmeDVt
OK maybe hypothetically, but not really a useful comparison when in reality a 53 year old ex-F1 driver actually just won the BRC championship title, winning 4 rounds from 5 starts. If he was 25, we'd...

Massive off!! Monte start in danger maybe?!
WRC Testing