it's been banned for a long time now - something to do with the dimension. basically whenever anyone enters it, the entire server crashes. for the most part (at least on kappa) if you needed something from there like the stuff for the next tier rocket, there was a workaround (usually from buying the stuff on the market, then EMCing the stuff).
so unless they fixed the issue with the dimension crashing the entire server... i greatly doubt KKMC will unban the dimension