The game is actually unable to delete your savedata - the coding for it doesn't exist. The only way to delete saves is to manually hit the "delete" button whilst hovered over each save or to erase your save folder (plus the backup save folder in your local drive if you're on OC, Mac or Linux).
Deleting the APK if you're on Android will of course delete everything, including saves.
If you don't feel like starting again, and you'd like a more recent savefile, you can find one pinned to the #help section in the CK Discord :)