Looking briefly at cases here in Ohio, a notarization appears to be valid even if the listed signing location is not accurate, so long as the signing is somewhere in Ohio. So, at least here, if the listed location does not match the actual signing location, it would not matter, it seems. 

Notarizing an out of state signature is prohibited, so if a notary is notarizing signatures that are occurring in another state, the notary can get in hot water, but I imagine It probably wouldn't make a difference to the borrower in most cases, for the same general reason as in the article-- courts are likely to find that the party 'defrauded' by the fraudulent notarization is the institution assigning the mortgage, and as long as they do not object (and they have no reason to object), the assignment likely stands.