Hi Lynden,
1.) The profile you have linked to is not the Sir Walter Scott who wrote Ivanhoe etc. The author of Ivanhoe, etc. lived 1771 to 1832 in Scotland. I do not see any current wikitree profiles that match the known details of Sir Walter the author that you are referring to.
The profile you linked to is listed as a son of Sir John Scott and wife Anne Pympe, but as far as I can tell John Scott and Anne Pympe did not have a son named Walter, despite what a large number of internet genealogies say.
2.) Protection of profiles is usually based on being part of a project. Although he was made 1st Baronet (of Abbotsford), he was not per se from a noble family so I am unsure if he would qualify for the Euro-Aristo Project; He probably could be listed under the Scottish Clans Project as a descendant of Walter "Auld Wat" Scott of Harden (a junior branch of Clan Scott)
Ref: Hutton, Richard H. Sir Walter Scott London:Macmillan, 1878.