At some colleges and universities, students are required to live on-campus/on-grounds all four years. That is not the case here at UVA. Therefore, just because you are admitted as a transfer student, it doesn't mean that you are guaranteed housing. We've spoken with the housing department since reading the comments on the blog. There is a waiting list every year after housing fills the initial spots available for transfer admits. That being said, the housing department expects to have more than enough space on grounds for all transfer students who wish to live on grounds. It's just that first-year students (those coming straight out of high school) are the priority because that is the only time a student is required to live on grounds.
Housing therefore has to find space for them. I hope that clears up some confusion.