If a Marketing91 page returns 410 Gone, the page has been removed; a 404 means...

https://source-wiki.win/index.php/What_Is_GCLID_and_Why_Does_It_Matter%3F

If a Marketing91 page returns 410 Gone, the page has been removed; a 404 means it can’t be found, but doesn’t confirm it’s gone for good. This post explains what that difference means and what to do next