Despite the fact that he was winning the race in votes, he feels that things are more important aside from the All-Star match and has decided that he will not be joining even in the case that he does win by popular vote.
“
After all its not worth it to waste your time and vote for me. Iam sorry for people who took their time to vote for me but there are many other more important stuff then a match on the other side of the world. "
While Diamondprox was felt necessary by many to increase the chance of Europe in winning a game dominating by Asians, it appear it is not part of his bigger plan and initiative and therefore, we will have to rely on another jungler. Diamondprox is known to have completely innovated and changed the way the game was played with his jungle and is still respected globally for his undeniable masterful jungle play and tactics.
Source (Russian) - VK