nikitoshq

Если кому-то интересно, то пофиксил так, не самый хороший подход, но все же:

class Structured_Data_List_Table extends ReviewsListTable {

    protected function get_review_count(string $status, int $product_id): int
    {
        $args = [
            'type__in' => ['review', 'comment'],
            'status' => $this->convert_status_to_query_value($status),
            'post_type' => 'product',
            'post_id' => $product_id,
            'count' => true,
        ];

        $args['meta_query'] = [
            [
                'key' => 'custom_field',
                'compare' => 'NOT EXISTS',
            ],
        ];
        return (int)get_comments($args);
    }
}

add_filter( 'woocommerce_product_reviews_list_table', 'replace_reviews_list_table_class', 10, 2 );

function replace_reviews_list_table_class( $output, $reviews_list_table ) {
    $structured_data_list_table = new Structured_Data_List_Table();
    $structured_data_list_table->prepare_items();
    ob_start();
    ?>
    <div class="wrap">
        <h2><?php echo esc_html( get_admin_page_title() ); ?></h2>
        <?php $structured_data_list_table->views(); ?>
        <form id="reviews-filter" method="get">
            <?php $page = isset( $_REQUEST['page'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['page'] ) ) : 'product-reviews'; ?>
            <input type="hidden" name="page" value="<?php echo esc_attr( $page ); ?>" />
            <input type="hidden" name="post_type" value="product" />
            <input type="hidden" name="pagegen_timestamp" value="<?php echo esc_attr( current_time( 'mysql', true ) ); ?>" />
            <?php $structured_data_list_table->search_box( __( 'Search Reviews', 'woocommerce' ), 'reviews' ); ?>
            <?php $structured_data_list_table->display(); ?>
        </form>
    </div>
    <?php
    return ob_get_clean();
}