Someone other than 07jjackson has created a user page with that name containing the following:
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Does this user exist? Should the page be deleted?
The user does exist in the sense that it appears on [[Special:Listusers]], which (developer please confirm) means that the login account was created. OTOH, the account has made no contributions. I'd leave a note on the talk page of the creator of the page, but we might as well keep it for now.
-- Toby