The compliance dashboard credits a product for attributes it takes from the style it belongs to, matching what the product page already displays.
A product counts as having an attribute if either level carries it. This affects both the per-attribute compliance figures and the Data Errors list.
This covers product attributes. Products that hold no attribute at either level are still flagged.
Expect lower data-error counts and higher compliance percentages where attributes are maintained at style level. Numbers update after the nightly refresh or a manual Refresh data on the dashboard.