SSOGM:
IIRC both players were spinning too many plates, so took a virtual step away. As they never asked to be removed from the game, they haven't been. If, at any time, they wish to reappear they will.
I’ve been GMing games here since early 2006 and IMO when a player states “I need to step away for an undetermined amount of time” is often a soft sell of: “I want to leave the game but don’t want to flat out say so.”
That said if a player actually gives notice they are stepping away (as opposed to ghosting from the game) it is enough to retain the player and not hand the character off to another player.