Tuvok was seen shaving in Year of Hell, if I remember correctly.
I'm not convinced as I don't think "Year of Hell" really happened.
It was another VOY episode where they cheated by using time travel.
If Kirk had 17 temporal violations, I wondered how many Janeway had?
How does time travel change anything about the idea that Vulcans need to shave?
Even if Year of Hell didn't happen, Tuvok still needed to shave.