Small chain legal

I have to admit, I’m thoroughly confused. Jumpers are still listed.

and, despite what that page may say, they are compatible with V5, I use them all the time.
Are they actually illegal ?

some teams/schools have been part of the program for 10+ years and have huge collections of legacy parts, I just don’t get where this is going and how it can be enforced when most inspectors I meet get recruited on the spot and have no knowledge of anything that’s not called out on the inspection checklist.