The db will still have the entries because wfa db is populated on DFM acquisition. Your volumes will be deleted from ONTAP through the workflow. DFM will have to monitor the filer in the next monitoring cycle and mark them as deleted from DFM. WFA will delete the db entries only in the subsequent acquisition cycles when it runs DFM queries and realizes that the entries from DFM are deleted.
WFA acts on ONTAP directly, this step has no connection with the db
WFA db gets data from DFM db which in turn waits for monitoring cycles to be completed and mark the ONTAP object deleted.