They do make sense, and i remember all the chemicals Byte identified around the pod and said it was for severe burns, so maybe a combination of this and Byte's ability to heal and maintain Alex' body for who knows how long.... witch mean Alex might be like 1000 years old lol !
As for Byte's origin and identity, i think i remember that Glitch said they were "created" in this world by the humans with the code they "heard" from Soulcreek and put into machines (that would explain the Epoch of Technology). But if Byte was put into Alex during his early state of recovery int he pod, where was he before that ? Was he even concious he was in a machine before being into Alex ? Because he doesn't seem to remember that, just like he wasn't even aware he blocked Alex' memory of pain and suffering from him. Glitch seemed to be aware he was in a machine because all he waned was to "Ascend" in a human body so maybe Byte really IS different from the other "Demons". He may be in denial because he comes from the same place as them but he's not really the same as them (if that make sense). He's gonna be in a "slef discovery" state from now on i think.