User blog comment:Wikian13000/Not canon fanon?/@comment-396366-20101023030444

The template stands for Non-Canon Friendly.

NCF would depend on the article. If it's a power-level issue such that you mentioned, then it's NCF. Also, if there's a severe chronological issue such as Goten being the father of Goku, then that's also NCF.

But if it's a minor chronological issue, such as the Kai planet still existing, then the issue is considered Alternate Timeline.