The latest version of the Scrum Guide contains this sentence:
Various projective practices upon trending have been used to forecast progress, like burn-downs, burn-ups, or cumulative flows. These have proven useful. However, these do not replace the importance of empiricism.
Is this a typo? Since burndown charts the and CFD's only contain after-the-fact information such as number of tasks remaining and number of work items in each state, how is that not considered empirical?