What is retro change?

Excuse me, could you please clarify what you mean by "retro change"? Is it a specific term related to cryptocurrency or finance? If so, I'm not immediately familiar with it, and I'd like to know more about its definition and context. Is it perhaps referring to a change in policy or practice that reverses a previous trend or decision? Or is it a term specific to a certain platform or technology within the cryptocurrency space? Any additional information you can provide would be greatly appreciated.