This is really funny honestly, I agree with you completely and also no club from outside the EPL will even pay £50m for Jackson with how he has been making a mess of himself since last season and the Saudi you talked about should have come knocking to get him since Chelsea have decided to sell him but up till now all we have been hearing are rumors and I don't see any club getting him for £80m not to talk of £100m, if I'm to be honest about this Jackson's issues and the amount placed on him, it will be a disgrace to those players who are worth the amount £100m and above in the transfer market if any club should get Jackson for that amount, not his type that should be placed with that amount.
The price tag is too high but that doesn't mean that Nicolas Jackson is a worthless player. He is strong and has pace, but he needs to play under a coach who can understand his weaknesses and help him correct them and improve on his strength. Chelsea is a big club and might not have such space to experiment and develop players. Moving to an average club might help build his confidence.
The Saudi Professional League targets players who are in good form, experienced, and popular. I doubt Jackson has such qualities now. He might end up going on loan or remain at Chelsea if the club fails to reduce his transfer fee.