You raise a valid point, but this is a competition, not intended to be an accurate assessment of each producer’s skills. Each challenge will be easier or harder depending on your individual skills; that’s the point of it (hence “challenge”)
The bias is definitely going to be real, and that’s hard to get rid of. But again, by joining the tournament, you’re asking to be judged by a judge, not an algorithm or some kind of 100% accurate measurement system.
TL;DR It’s a competition, therefore not meant to be fair