If you use various tools to ensure anonymity and confidentiality, then you probably won't have any problems. Even if you were unable to access the coinomize.biz website on the first try, you can always use another tool to bypass the blocking and successfully use the site.
Accessing websites using a North Korean IP is, of course, exotic....
At the same time, of course, hackers and organizers of DDOS attacks pose a great danger to any Internet services (including mixers).
Therefore, we can only welcome the policy of the coinomize.biz mixer to ensure the safety of its clients.