Twin Peaks had some rather bizarre plot stuff that essentially said the story will pickup in 25 years and then “froze“ some of its cast. By making a sequel 25 years later they were able to pay off what they had setup, as if it were always planned that way for season three. It sounds like the new Clone High original characters have been frozen all twenty years, about enough time to grow a new generation of clone teen characters. It pays off the cliffhanger of them getting frozen, like the plan was always to wait twenty years for season two. Both shows had in-universe explanations already built into their very long delays between seasons