While "no system could use it to actually identify the DMX data in question", it will provide existing configuration information to the querying device. It would allow a control desk to identify a server configuration so the operator can manually patch the server, deciding manually how to assign and connect the DMX stream.
Granted, it is a bit ambiguous to have both an RS-485 connection and an ethernet connection, but it is physically possible and is not disallowed by any existing control specification. It is a situation that can exist for which there is no connection string.
If nothing else, it could serve as a diagnostic to alert the operator that a sever might need to be reconfigured to use some ethernet-based control stream.