I don’t think they’ve given any indication at all as to who the target(s) might have been, or even if “targeted” refers to individuals rather than something like “everyone at the neighborhood party house” or “sorority girls and frat bros” etc.
I think most people have focused on one or more of the victims being targeted because they were the occupants killed while the survivors were spared, but I agree that does not necessarily exclude the survivors from possibly having been targeted.
I think most people have focused on Kaylee because she was the unattached person of the four victims and had a recent break-up, and her family has been vocal about her whereabouts and communications that evening and introduced the grub truck video that some viewers suspected included potentially relevant details. Secondarily, people have focused on both Kaylee and Maddie because, in addition to the grub truck observations, there’s a presumption the two were on the highest floor and could have been spared if the killer entered on either the first or second floor (another presumption at this point) and the target was primarily Ethan and/or Xana. But I don’t think LE has revealed anything at all to suggest Kaylee and/or Maddie were more likely targets than anyone else at the residence, including the surviving roommates.
I find it odd that so little has been revealed about the whereabouts of Ethan and Xana, and to a lesser degree the surviving roommates, but they might only have revealed comprehensive details of Kaylee’s and Maddie’s whereabouts due to the grub truck video being released through other channels, whipping up questions and rumors that needed to be addressed.