This does not necessarily make Vland immune. Virus is not some little program that errors out and crashes if it doesn't succeed on it's first try. It is an unimaginably adaptable lifeform that was designed specifically to invade foreign and alien computer systems and shut them down. Having a different transponder doesn't save you, it just delays the inevitable by about 10 minutes (give or take 10 minutes).
Let's not forget that ALL of known space crashed when the virus came. The only ones who survived were the ones who had advanced word, and most of THOSE instances saw the warning carrying the virus as well!
If Vland was at TL15, then Vland did things the way everyone else did. The Vilani megacorps are concerned with making money. They're not going to use antiquated TL 9 gear or techniques that are incompatible with the mass of their customers. That's expensive. Like all life forms, they will adapt to whatever costs less to achieve the desired goal. They're going to use stuff that's compatible with a wide spectrum of techs and techniques, just like everybody else, or they are going to fail financially. If you do not remain competitive, your company goes away. Even MS couldn't last long if it stopped pushing the envelop. (Save your jokes, this isn't the place.)
Being traditional does not make one stupid, nor prevent one from seeing advantage where it lays. Tradition pays homage to one's past, to honor the sacrifices of those who have gone into the night before us. It is NOT a crippling disease.
Take a look at the navy. A navy is a technological feat. Even small differences can be critical. You have to stay ahead of your competition to have a chance of winning a battle. Yet the navy has a lot of traditions. If you take a look at some of them, you'll see they are all harmless homages. If tradition gets in the way of technology that improves survivability, guess which goes out the window?
The Vilani jum-dimming is a tradition. It is harmless. The Solomani Penguin on the holotank is also a harmless tradition. If there was some compelling reason to stop doing them, they would stop in a heartbeat.
So the Vilani are no luckier than the Hivers (indeed, less lucky because they were closer to the problem zone, and not as good at computer stuff), and no more well protected than Daibei. The Vilani were buried just like everyone else. Unless MJD reveals some compelling bit of Canon that tells us something, then he's pulling out of his ass (like any good GM should), and it will be at least as believable as the Rebellion was in the first place.
