He’d get slaughtered.

Not just him, most of the grid. There’s a huge circlejerk around f1, motogp and other apex classes of motorsports, but those guys are quite pampered in comparison to the hardcore wolves that race at a high level that isn’t the highest level. Ferrari challenge, Porsche cup, Isle of man, wsbk, endurances, and other stuff would be graveyards for these ‘superstar’ racers.

Not saying the hardcore low level racers would do well in f1, but that road goes both ways, talent isn’t as transferable as people think.