It also had a stipulation that no aggrieved person could resort to any legal remedy if they felt their dismissal was unfair.
That’s not quite correct, a
person always has the option to pursue a legal remedy, the agreement to which you refer required the
union to cease all legal approaches.
This is normal for settlements, it is after all a settlement, no point offering it if the other party carries on taking you to court.
The rest of your position I agree with generally, potential progress is more than has been achieved so far after all. Let us hope for a good (as possible) result soon eh.