Wikipedia:Wikipedia is not a reliable source for citations elsewhere on Wikipedia. As a user-generated source, it can be edited by anyone at any time, and any information it contains at a particular time could be vandalism, a work in progress, or simply incorrect.
https://en.wikipedia.org/wiki/Wikipedia:Wikipedia_is_not_a_reliable_source#:~:text=Additionally%2C it is possible that,%2C and non-English Wikipedias.