Wait, what? Cold storage removes you from guilds intentionally?
Why on earth?
Cold storage is a type of pause that is
effectively indistinguishable from disappearing forever.
It must be, because anyone who pauses their character this way—or has it autopaused for them, which uses the same code—cannot be assumed to ever be returning to the game.
It's not fair to people who are actively playing their characters to have valuable elder slots—and other guild positions—taken up by characters who might very well be gone forever.
Put bluntly: If you want to keep anything but your characters' reputations, you need to keep playing them.