There is absolutely no way in hell that a points deduction AFTER the end of the season will be allowed to stand.
Can you imagine the outcry/fury/shock/etc etc if they tried to!!
I think a points deduction after season end would have to be applied to the following season.
All they have to do is move away from points deductions.
Fines, transfer bans, squad limits etc. can all be applied at any point in time, once all appeal avenues are dealt with in a considered and transparent manner that is not forced to be shoe-horned into a season context.
They've made their own problem here, a legally questionable regulation, with unclear and secretive processes, timebound by an arbitrary date that cannot work.