Xlobby does not require to know the TV tuner card. That duty is up to the capture/TV software you use. There are skins that integrate some of the leading capture/TV software with XLobby. Ones like Heavy Metal use a SageTV interface. If using XMLTV, again Xlobby doesn't require the knowledge of the TV card, it can go out and download the EPG without even having a tuner card installed.
Check out the thread below:
http://www.xlobby.com/forum/viewtopic.php?t=4030
It basically is the same thing your asking about.
I hope this was helpful.
David