Right, but the point is the disease has to be a cause of death. A fair number of people with HIV and access to modern treatment (as Xanatos would be) don't actually die of it, or complications relating to it, or whatever. This is generally described as 'you'll live long enough to die of something else', that's the reference I was making. It's arguable, of course, but if this makes HIV not an actual cause of death, then you can't use it on the Death Note.