disable feeds for a specific CPT

cpt-feed-disable.php

<?php
add_action( 'init', 'register_cpt_test' );

function register_cpt_test() {

    $labels = array( 
        'name' => _x( 'tests', 'test' ),
        'singular_name' => _x( 'test', 'test' ),
        'add_new' => _x( 'Add New', 'test' ),
        'add_new_item' => _x( 'Add New test', 'test' ),
        'edit_item' => _x( 'Edit test', 'test' ),
        'new_item' => _x( 'New test', 'test' ),
        'view_item' => _x( 'View test', 'test' ),
        'search_items' => _x( 'Search tests', 'test' ),
        'not_found' => _x( 'No tests found', 'test' ),
        'not_found_in_trash' => _x( 'No tests found in Trash', 'test' ),
        'parent_item_colon' => _x( 'Parent test:', 'test' ),
        'menu_name' => _x( 'tests', 'test' ),
    );

    $args = array( 
        'labels' => $labels,
        'hierarchical' => false,
        
        'supports' => array( 'title', 'editor' ),
        
        'public' => true,
        'show_ui' => true,
        'show_in_menu' => true,
        
        
        'show_in_nav_menus' => false,
        'publicly_queryable' => true,
        'exclude_from_search' => false,
        'has_archive' => true,
        'query_var' => true,
        'can_export' => true,
        'rewrite' => true,
        'capability_type' => 'post'
    );

    register_post_type( 'test', $args );
}

// disable all feeds
function digwp_disable_feed() {
	if( is_feed() && is_post_type_archive('test') ) // or use get_post_type() == 'test'
		wp_die(__('<h1>Feed not available, please visit our <a href="'.get_bloginfo('url').'">Home Page</a>!</h1>'));
}

add_action('do_feed',      'digwp_disable_feed', 1);
add_action('do_feed_rdf',  'digwp_disable_feed', 1);
add_action('do_feed_rss',  'digwp_disable_feed', 1);
add_action('do_feed_rss2', 'digwp_disable_feed', 1);
add_action('do_feed_atom', 'digwp_disable_feed', 1);

Adapted from

http://digwp.com/2012/10/customizing-wordpress-feeds/#customize-filters-hooks

in response to

https://www.facebook.com/groups/advancedwp/permalink/712330335495850/