Thanks for this report. I have clarified the documentation to reflect the purpose of the plugin: to find products which have an image set but where the image does not exist.
If you just want to find products which don't have the image field set, use a SQL query in phpMyAdmin:
SELECT p.products_id, pd.products_name FROM products p, products_description pd WHERE p.products_id = pd.products_id AND p.products_image = '';



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