En la web oficial pone esto acerca de los juegos en red:

DNAS Compatibility:
DNAS (Dynamic Network Authentication System) is an authentication system used in all recent online capable PS2 game titles. It is used for a number of things - for example, checking if you are using a backup of a game or a modchip. In this case the check takes place when you go online with the game. If a backup or modchip is detected then DNAS authentication will fail and you will not be able to play the game online. You cannot go online with a DNAS enabled game unless the DNAS authentication is successful. When HDAdvance is used to play a DNAS enabled game, any attempt to go online will be unsuccessful as the DNAS authentication will FAIL. There is currently no way around this, other than to use your original game disc to play the game online.

Vamos, que si tiene que autentificar las DNA´s no funcionará.

Pero por probar....

Un saludo.