We have considered adding this in the past, but at the moment our design principle is to only perform actions that can be fully reverted with a single click. Because it is very difficult to revert a product delete action. So we have decided not to support bulk delete directly in the Bulk Product Edit app.
However, you can use the product filters to select products, and then apply a tag such as to_delete. Then you can use Shopify's normal editor to find all the products with this tag and delete them in bulk.
Product filters should be based on your use case. then you can bulk add tag "to_delete".
Go to Shopify admin products page, and filter products with "to_delete" tag, and click the checkbox to select all products on this page.
Select all 50+ products with this tag
Click "More actions", click "Delete products"
That's all. Please be cautious and extra careful when deleting products. This is not a reversible action.