Hi!
With posts I mean rows in the database table. The statistical data is shown in reports, like Pages but the data is stored somewhere in a row of a database table. We like to delete data from the database so it can not be shown in any report like Pages, Pagetitels etc.
I hope I could explain so you can understand what I mean better?
I also created a feature suggestion about this case: Delete posts from database using a guide or plugin