That’s the price for the blue set of gear reducing in price over seasons, not off set pieces/catch up pvp gear in general. Off set pieces forever remain that price, and it only gets worse when there are multiple rings AND a battlemaster trinket to farm in future seasons.
Also its hilarious that you think this is somehow justified in saying “don’t worry, it’ll be a whole 20% cheaper in season 2 and another 20% cheaper in season 3”. This blue set will continue to be worse and worse as better gear comes out in future seasons. In season 3 you’d still be looking at a 281ish hour grind for a set of gear that is that outdated and low quality by that point in the game. Just such an insanely bad system.