On the Loot History tab, the output is filtered by

if not MonDKP_Loot[i].deletes and not MonDKP_Loot[i].hidden and not MonDKP_Loot[i].deletedby then

The export feature does not take into account deleted or hidden loot items, nor does it make any distinction in the output that these are deleted or hidden items (because they show up in the export).