As per the definition of "declaring" (important parts in bold):
Someone can take over an account for a retired player if it is declared and they violate no other CL rules in the process (RR limit, 2 clans, etc). A player can also be replaced entirely in a tournament due to retirement (if you have no access to their account), but only in games not started yet.
With a supplementary
Any form of notification to the CL panel should do.
By this definition there's nothing that says a member of the clan has to make it known that the player is inactive/retired/MIA.
And as such, to get a respectful amount of replacement games for a clearly retired player, here is the absolute first undisputed notification that Angry Koala is gone.https://www.warlight.net/Forum/159812-clan-league-8-division-c-official-thread?Offset=73
More specifically, here:
2 Angry Koala boot losses had already happened on Great Lakes, and 2 on Treasure Map. As such, there are only 3 on Treasure Map and 2 on Great Lakes (get to that later) to remake.Treasure MapGreat Lakes
Although Angry Koala was booted in the CORP/LEA 3v3 Great Lakes game, CORP still won, despite having an AI teammate. That raises the question, is it really worth remaking a game that was already won with a handicap?
Although for fairness this game could also be remade if it means all the others would:https://www.warlight.net/MultiPlayer?GameID=11580776
Finally, if the rules suddenly change again right before I finish this post, I did directly inform Pushover at one point, but that was before I realised the previous declaration. In that case, only the CORP/VS (not started) Great Lakes game is remade- but that wouldn't be closer to the fairer option, nor the more realistic option because it was declared he was MIA before I sent the private one.