Rightclick the table you loaded from the object library, select properties and check the attribute values. Some contain number of inserts/updates/deletes of the last load. You find this information in AL_ATTRIBUTES or whatever it is called.
The AL_STATISTICS is the actual table for runtime statistics but it does not break down the rows to insert/update/deletes.
The AL_ATTR table (which is where the table_attribute() function goes to get its data) is only for the last execution of the object. If I have two jobs running in parallel that use the same Dataflow then I could get the wrong information.
If you query AL_STATISTICS just right (not an easy thing to do) then you can get the exact statistics you are looking for. But, like Werner said, it doesn’t break the statistic down into insert/update/delete.