I'm dubious about modifying a virus to escape our immune system - seems like that could come around to bite us in the ass. But they basically identified a receptor unique to cancer cells and what's different about binding to it vs binding to the similar version in healthy cells. Seems like a great drug target. You could even probably make a drug that binds to it and triggers an immune response, get the immune system on side. I'm not an expert in the field by any means, but I'd rather see that than a super virus.