So then what exactly is the point of releasing a beta if they "can't" change anything? Seems kind of weird since they ask people to test the DLC before release and report the bugs they encounter. I guess they just want to know what they messed up on despite the fact that they supposedly can't fix them?
They could be considered two different products? That is, the Dragonborn DLC beta is, well, one product and the actually released Dragonborn DLC is a different product? This would require that beta users uninstalled the beta DLC prior to installing the "real" DLC. I haven't been a beta tester, so I don't know if that is how it works. And it could differ from platform to platform. Steam workshop can update user created mods, but maybe there are some issues with doing the same on XBox and/or PS3?