Following is what the Help section says:
We don't delete duplicates, we merge them.
Merging ensures that the Activity Feed, Trusted List, and any unique information on the duplicate profile will not be lost. If anyone had a link to the old profile it will automatically be redirected to the new profile. Deletion creates dead-ends in our database and leads to confusion.
If these were partial duplicates of Johanna Welter, could you merge them into her profile?
If there are exceptions to the deletion rule, others will need to address it.