but its seems not fair to those who got lower 8 not because of tanking.
correctly.

In my opinion the only thing that Nordeus can do is making that every team in the League after one season lose 20%, so in this case they will focus on getting on a better position so they can play the SL/CL, because if we take it as you said, they will play 1 CL and that's it, 'cause if they end lower then 8th place, next season there will be no SL/CL.