The cod2 client doesn't show all the servers listed, but its definately being seen by the master servers. Unfortunately, its a bug with cod2 and hopefully will be fixed in the upcoming patch, but it may not be since it wasnt fixed for vanilla CoD or UO.
You can see it here
listed as g6 NYC Recruiting and when it was last seen. CoD2 dedicated servers already have the master servers hard coded into it so adding the master servers to the server.cfg makes no difference. I also noticed that you asked on iwnation and got a similar response.