This plugin changes the destination that vendors are redirected to when they delete a product.
<?php
/*
 * Plugin Name: Easy Digital Downloads - Change Vendor Delete Product Redirect
 * Description: This plugin changes the destination that vendors are redirected to when they delete a product.
 * Author: Kyle Maurer
 * Author URI: https://easydigitaldownloads.com/
 * Version: 1.0
 */

function kjm_change_vendor_delete_product_redirect() {
	$redirect_to = get_permalink( EDD_FES()->helper->get_option( 'fes-vendor-dashboard-page', false ) );
	$redirect_to = add_query_arg( array(
			'task' => 'products'
		), $redirect_to );
	wp_redirect( $redirect_to );
	exit;
}
add_action( 'fes_vendor_delete_product', 'kjm_change_vendor_delete_product_redirect' );
To implement this snippet on your site, create a brand new, empty WordPress plugin and paste the above code inside.