DVD-A hires can be passed digitally at 96/24, but above that it cannot. As has already been said quite a few times, even SACD can be passed via digital as long as you have a player AND receiver that both use a SPECIAL digital connection, such as Firewire, i-link, denon-link, etc...
If you have the 2200 set to Video priority for DVD-A, you aren't accessing the DVD-A tracks on the DVD-A discs. The DVD-V content on DVD-A discs can be played by any dvd player.