I’ve found 2 ways to delete a WSD printer port:
remove-printerport -WSD-PortName -computer serverName
You can use “WSD-*” if you only have one WSD port to delete.
With Windows GUI
Assuming you’ve moved your printer to a different port, just add a dummy printer to the server using the WSD port to be deleted, then delete the dummy printer. Windows should delete the WSD port automatically.