Grok does cite that claim as being from https://countrystudies.us/spain/30.htm a page in Eric Solsten and Sandra W. Meditz, editors. Spain: A Country Study. Washington: GPO for the Library of Congress, 1988.

The nice thing about grokipedia is that if you have counter examples like that you can provide it as evidence to change it and it will rewrite the article to be more clear.