So with Valencia part 2, new level 65+ champion weapons were added to the PvP shop (note: previously, the strongest version were the level 60+ ones that cost 4000 scrip). However, these new weapons cannot be currently bought even if you are champion. They have no scrip cost!
If you go over to the shop and look at these new weapons (on the third page of weapons), you'll see they have no scrip cost. So no one is able to buy them even if they are champion.