User blog comment:MTanke/What a F*ck?/@comment-8642280-20180417012606

These Detail Pages are mobile-friendly for in-game usage just to see all the new content of every event and how to obtain them. Old detail pages still exist for a while until the xml document 'expires'.

In the address of the link you provided it was of the 'gamedata's' 80th event of the game. The current event number is 120, and the previous tower event was numbered 199. Just rename that number part of the address to find the most recent event. (Or just visit the current event's Details Page link)