Note: Please read the comments to this post. They help explain the issues involved with the Family Tree.
It is historically impossible for this person to exist. The first European settlers did not arrive in what is now Rhode Island until 1636 and the other places mentioned did not exist until well into the 1700s. However, under the present restrictions of the FamilySearch.org Family Tree, I cannot delete this person. He is a bugaboo. I could try to merge him with someone, but who? What is even more annoying is that this person has "temple ordinances" available. The answer to the question in the title of this post seems to be a resounding no.
The tragedy of the situation is that this non-existent person and the many, many others like him also named William Tanner are like a smoke screen preventing me from making any real progress in extending my verified Tanner ancestral line. The problem is that unknowing people keep attaching this entry and others like it to my verified family line. If I try to merge all these "duplicates" I will be making the same mistake all the other contributors are making in assuming that there is only one William Tanner in Rhode Island in the 1600s and 1700s.
If I did decide to merge these obviously wrong entries, I would end up with one huge wrong mega-person who would still get wrongly added into my ancestral line. I suspect that every former IOUS (individual of unusual size) in the Family Tree is now fully represented by a cloud of unmanageable duplicates.
Any reasonable and logical suggestions would be appreciated.