Answer by Robert Went for How to use has_archive but disable feed per post type?

I just got this working in a theme by checking if we're on the archive page for an array of custom post types and then removing the feed link actions:

function themename_remove_feed_links() {    if ( is_post_type_archive( array( 'gallery', 'client', 'testimonial', 'slideshow' ) ) ) {        remove_action('wp_head', 'feed_links_extra', 3 );        remove_action('wp_head', 'feed_links', 2 );    }}add_action( 'template_redirect', 'themename_remove_feed_links' );