If you have database access, and are familiar/comfortable with MySQL, you could write a simple update script on the product table, replacing all ‘review_status’ to be ‘yes’.
I am not familiar with WooCommerce back end, but you will just need to find the proper table, column, and value, and it would be a 5-10 second long ordeal.
UPDATE [wp_woo_products_table] SET [product_status]='[enabled/yes]'
Ignore the square brackers [] in the line above, they simply mean placeholders for the proper values.