Needs to clean old DC server name on AD sites

Hey Experts, I ran the command "repadmin /ISTG on the replicating DC at the HQ site
See below, I get 4 site displaying 4 DC that were deleted at least a few years a go, those DC don't exist anymore.
6919ElmwoodSWSCDC1\0ADEL:8b04b4da-ed4c-4406-97c5-e53d6df9f663
           451UniversityUADC1\0ADEL:1e60d5ec-f733-473f-927e-0636f262be3c
                 26S40thS40DC1\0ADEL:03fe0ad8-7629-4420-96e3-5194403836c0
                137S58thS58THDC1\0ADEL:26825cab-a7fb-477b-bf41-d1d72597cf40
These sites still exist and their current DC names are different, for example 6916Elmwood is EADC1
Is there a way I can removed them from the domain?
TIA guys

C:\>repadmin /istg hqdc2 /verbose
Gathering topology from site 3801Market (hqdc2.mydomain.local):
                   Site                ISTG
      ==================   =================
              3801Market               HQDC1
             6919ElmwoodSWSCDC1\0ADEL:8b04b4da-ed4c-4406-97c5-e53d6df9f663
           451UniversityUADC1\0ADEL:1e60d5ec-f733-473f-927e-0636f262be3c
                 26S40thS40DC1\0ADEL:03fe0ad8-7629-4420-96e3-5194403836c0
                137S58thS58THDC1\0ADEL:26825cab-a7fb-477b-bf41-d1d72597cf40
            5429Chestnut              N46DC1
              5828Market               MSDC1
             7821Bartram              N49DC1
            5501Chestnut              S55DC1