We check this website, now xn--3-wtbj.su is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is xn--3-wtbj Down Right Now? - NO! xn--3-wtbj is up!
If you have problem with access to site xn--3-wtbj, and domain xn--3-wtbj.su is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).