Since its canoncity is yet to be proved, shouldn't this be removed from Timeline article? Or at least indicated that it is non-canon (or semi-canon) - similar to "There is But One Ultimate Way". I don't know about other users, but for me it can be pretty confusing. While the "CotM" article states that is happens after main events of Alicization arc (Volume 18) and also that it is standalone fantasy, in Timeline article we can see the story is set during Volume 16.
Maybe there is something I don't understand or facts that I don't know. Nevertheless, I think any ambigous things should be omitted, at least for the time when it is confimed by new works or author himself.