Birth/death records are records. Statistical analysis of those records may be done, the records are not in and of themselves statistics. A duplicate record would not be marked “mean absolute error”. Mean absolute error measures the average magnitude of errors in a set of forecasts/estimates are from actual values.
MAE is a name, like all the other names listed.
And just what do they use for their statistical analysis? LISTS?
Forget it, you have no more idea what MAE stands for in that context than I have, but at least I’m asking questions.