您不需要设置新的WP\\U查询，因为您正在循环遍历八达通的数据。在你的情况下，我会做以下事情：

创建一个函数，用于检查是否有具有给定octopus\\u id的帖子

function post_with_octopus_id_exists( $octopus_id ){

    //If for some reason the $octopus_id given is empty return false
    if( empty( $octopus_id ) ){
        return false;
    }

    //Do a meta query to fetch posts with the given $octopus_id
    $args = array(
       \'post_type\'      => \'employee\',
       \'post_status\'    => \'any\'
       \'meta_query\'     => array(
            \'relation\'  => AND,
            array(
                \'key\'       => \'_octopus_id\',
                \'compare\'   => \'EXISTS\'
            ),
            array(
               \'key\'        => \'_octopus_id\',
               \'value\'      => $octopus_id,
               \'compare\'    => \'=\',
           )
       )
    );

    $the_query = new WP_Query( $args ); 

    //if there are posts with the given $octopus_id return true otherwise return false
    return ( $the_query->have_posts() ? true : false ); 

}

foreach ( $records->data as $record ) {

    if( ! post_with_octopus_id_exists( $record->id ) ){
        echo "Hello";
    }

}