Is it safe to delete this empty postmeta?

The WP Featherlight plugin always adds a field in postmeta (wp_featherlight_disable) and unless we want to disable the Lightbox effect this field is empty. So I ask if it’s safe to use a filter, like the one below, to automatically delete when this field is empty.

add_filter('update_post_metadata', function($check, $object_id, $meta_key, $meta_value, $prev_value) {
    if(strpos($meta_key, 'wp_featherlight_disable')) {
        if(empty($meta_value)) {
            delete_post_meta($object_id, $meta_key, $prev_value);
            return true;
        }
    }
    return null;
}, 10, 5);

Thank you!