If he was simply a composite of two live beings who were aware ...
I don't want you to think that I'm saying the Tuvok and Neelix were individually conscious of what was going on while a composite, there was a single combined awareness. My position is that they apparently remember events. There was no surpirse when they materialize in sick bay, and Neelix didn't question Kes's "welcome back."
It of note that neither Tuvok nor Neelix seem to subsequently make any effort to become re-combined.