According to the manual:
Deletes a connection to a printer that was established by using ADDPRINTERCONNECTION

Since you want to delete a local printer, using DELPRINTERCONNECTION won't work. ADDPRINTERCONNECTION and DELPRINTERCONNECTION only work for shared printers and only under Windows NT/2000/XP.
You might be able to delete the local printer by deleting the appropriate keys in the registry. Check the following area for printer settings: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\
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There are two types of vessels, submarines and targets.