If you'd like to access product information for products that have been deleted from Shopify, you can do so within the Pio App. You might want to check if some quantity of the item is still in stock.
Searching Pio Inventory
Using the Dashboard's Inventory function, search for product names or SKUs normally:
If the product is still in stock inside the Pio grid, the product will appear in the search even if it has been deleted on Shopify.
Only after the product is no longer in stock and it has been deleted from Shopify will the product be removed from the Pio app and at that point will no longer appear in search.