Since the Twitter account has provided no useful details, I'm going to blindly speculate. My guess is that they are using a virtual business address service th

Since the Twitter account has provided no useful details, I'm going to blindly speculate. My guess is that they are using a virtual business address service that is commonly used by spam/fraud organizations (e.g., fake pharmaceuticals), and maybe ISNIC is cracking down on this due to abuse. They don't want their TLD to be known as a junk TLD like .ck, .gq, .info, etc. Or someone is attempting to take legal action against the owner of the domain and ISNIC can't comply because they just have a fake address with no known physical entity.