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