Icy Chill enchant

Hi, maybe I'm not the first to ask this. I would just like to know why there are still players here, for example, I meet them on Blackrock, especially paladins, who have the Icy Chill enchant on their weapons? As far as I know, it was deleted from the vendor a long time ago and cannot be bought anymore. Imho on Icecrown you can still make this enchant right? So why do these players have an advantage when they bought it years ago (or make it on IC) and still use this weapon with this enchant? It should be balanced somehow, delete it on all realms or allow it and then give it back to the vendor on blackrock. Thanks for reply and enjoy

https://wotlk.evowow.com/?spell=20029