You will have to ask staff. Only staff will know the reason it was closed. However, I was able to find Google-cached pages as recent as Jan. 20 so it seems to have been gone for less than 2 months. In combination with the lack of a database dump and the "unrecognized URL" rather than the "closed wiki" page, this would seem to indicate that the wiki may have been removed due to ToU violations. However, this is just speculation; not fact. Only staff can tell you the actual reason.
Cuhrayzee Games wikia was backed up and deleted because anonymous people were vandalizing and destroying it for a long time, also we don't have control of this wiki and contributors might use it to do wrong things.
None of the current Cuhrayzee team didn't had access and there was plenty of pages which was deleted or vandalized by someone who was angry at Mike Kob. We don't want to be associated with this iteration and decided to move everything to a place we have control over, without unknown third-party messing with our work.
So, what you are saying is the Cuhrayzee wanted to have control of the wiki which it didn't at the time. Instead of having Cuhrayzee staff adopt the wiki and/or contact Fandom about the official partners program, it was decided to just ask Fandom to delete the wiki. This content is supposedly hosted somewhere else now. Is that correct? If so, where is the content now?
Because this wiki used name of community which grew past 4chan and extreme rhetoric this place breed, we don't want to be associated with what was written here, we don't want to be associated with people who contributed to doxxing and harrasement of several people.
New wiki will be hosted on private Notion page and is currently re-designed. All pages of old wiki are backed up.
Currently — no, but we are doing everything to set things up. Last year we managed to attract several people who currently helps us with new structure, we also doing some design work and adding new stuff which was found later or wasn't mentioned. Again, sorry for doing this, but at the time pages was created which put us in a same place as people who conducted actions we not support, and now as we try to do the right thing and expand on what wiki was, preparing videos and tutorials to be released, we just want to do our best to educate and help people, not to be involved in a drama.