Danil Klimov

/** @var WP_Post $obj */
add_filter( 'wpseo_sitemap_entry', function ( $url, $string, $obj ) {
	/** @var WP_Term $category */
	$category = get_the_category( $obj->ID )[0];
	if ( $category->slug !== 'press-center' ) {
		return $url;
	}

	return null;
}, 10, 3 );