According to this GitHub issue, the upcoming Shred feature for iOS will, from now on, always clear the shredded site from the site history.
If it is possible, I believe it would be ideal if users had the option to toggle per site and globally whether or not a site or all sites that were shredded were scrubbed from the history. That way, users such as myself that would like to use the feature as an iOS version of “Forget me when I close this site” or “Clear cookies and site data on exit” can do so without losing their history information, as I would like to enable shredding globally after the site/the app is closed.