juggledad

The theme you are using is a premimum theme that we don’t have access to. You need to request help from the theme’s support page https://themeforest.net/item/sport-wordpress-club-theme/9258218/support

If you want the wp_dequeue_script to run on those pages, then the
OR (!is_page(........
Should be
OR (is_page(........
Remove the !

Try it like this

add_action('genesis_before_loop','cus_tom_single');
function cus_tom_single() {

if (is_page()) {
    if ((get_post_type() != 'movies')
    OR (!is_page( array('about', 'contact', 'sitemap' )))) {
        remove_action( 'wp_head', 'movies_display_redirect' );
        remove_action( 'wp_footer', 'movies_display_inline' );
    	}
    }
}
?>

Well anything other than a plugin will be a change to the WP core and will go away each time you do an update.

You could request that WP make this a setable option.

It might be helpful if you explained your issue with a little more detail, like what version of WP, what theme? did you disable all your plugins? are you using the visual or text editor? what are the exact steps you are taking from beginning to do the edit? do you actually have any images? what type of media is it?

Or is the only way to add one of the older plugins which do this? like
https://wordpress.org/plugins/open-external-links-in-a-new-window/
will those even work with the upgraded editor in wordpress 4.6?

Have you tried it?

Why have you changed the first part from get_post_tyope to is_singular?
have you tried it with just the is_singular conditional?