I noticed that as well! It confused me a bit at first. They say that their "image generation stack" is referred to as unCLIP, and I was trying to figure out how

I noticed that as well! It confused me a bit at first. They say that their "image generation stack" is referred to as unCLIP, and I was trying to figure out how it's distinct from DALL-E 2 at first! My only guess would be that unCLIP is the end-to-end image generation model, but if the model is used for manipulation, interpolation, or variations, then it is referred to as DALL-E 2. So unCLIP is a subset of DALL-E 2.