When AliExpress merchants delete the sku(variant) of a product, the product will be marked as Unavailable by DropShipMan.
Override products resynchronize variants for products in your store. Of course, if it is covered by another product, the supplier of this product will be replaced.
These variants can be deleted in batches. But if you configure Auto Update> When variant is no longer available is Remove variant. This message is just to remind you of the changes.