This answer prompts me to ask this question, though this meta discussion is about the problem in general.
In cases where the changes in the quoted sources are purely cosmetic (no change in meaning and content), the post can be edited by a simple copy/paste.
However, in the case above, the original wiki page went through a slim-down, which removes some of the quoted content, especially the part in spoiler.
Since it is not on the wiki anymore, I don't know whether the quoted information is still reliable or not.
The same problem happens on Can Sasuke use Tsukuyomi?. The list of Tsukuyomi users on Naruto wiki did include Uchiha Sasuke at one point, but has since been removed.
What should we do with these posts? The obvious thing is to comment and wait for the author to edit the post, but not every user visits the site frequently.