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If the reason the character is missing is explained in-universe, it's Written-In Absence.
2025: the year it all ends?It's not a question of in-universe, but in-work.
Is it a Written-In Absence if it is given by Word of God as opposed to written/explained in the work?
You're being redundant; In-Universe means "present in the work". Written-In Absence is only for when the work acknowledges that it would be useful to have character around while Absentee Actor covers every occasion where said useful character is absent, unless the work acknowledges their absence. They're currently described exclusively, although they could easily be edited to have a super-sub relationship.
Link to TRS threads in project mode here.No, Word of God is an out-of-universe statement by the author. It is still Absentee Actor if an explanation is given out-of-universe. It is Written-In Absence if an explanation is given in-universe. If an explanation is given in supplementary material, it might be either/or, depending on the supplement.
Link to TRS threads in project mode here.To put it another way, In-Universe means it's something the characters are doing, thinking, or experiencing.
Working on: Author Appeal | Sandbox | Troper Wall

Question about Absentee Actor, which is about unexplained character absences. If Word of God or supplementary material explains the absence, is it still Absentee Actor if it's not explained in the work itself? What about explanations released after the fact?