Maybe 100%, getting all golds and all drivers too

It's not an exploit, just a glitch with the replay system for lap 1. You take that line into that corner very tight and I'm guessing it messes with the fence and positioning system. The respawn at 170 was just the game catching up.

I'll try and record a run to try and show it today or tomorrow.

Replays are buggy atm on Knights Path on the first lap, so I'm not actually falling off there and the replay has to catch up.