If when someone is Tuvixed they keep their memories, then Captain Doctor Frigleeman would’ve kept the memory that Captain Freeman wanted to keep everyone alive. If Frigleeman knew that, then why did she help T’Illups if she knew he was misguided?
Freeman said she planned to take them to Earth to have them figure out how to keep everyone alive, but my guess is that inside, she was using this to pass the buck to someone else and privately was pessimistic about the chances of figuring out a way to separate them without Janewaying them. That feels like a very Freeman thought process. But yeah, they ought to have said something on screen.