This gist is used in the tutorial https://www.vijayan.in/how-to-create-custom-table-list-in-wordpress-admin-page

get_posts_object.php

<?php
...
	/**
	 * Return instances post object.
	 *
	 * @return WP_Query Custom query object with passed arguments.
	 */
	protected function get_posts_object() {
		$post_types = $this->allowed_post_types;

		$post_args = array(
			'post_type'      => $post_types,
			'post_status'    => array( 'draft' ),
			'posts_per_page' => self::POSTS_PER_PAGE,
		);

		$paged = filter_input( INPUT_GET, 'paged', FILTER_VALIDATE_INT );

		if ( $paged ) {
			$post_args['paged'] = $paged;
		}

		$post_type = filter_input( INPUT_GET, 'type', FILTER_SANITIZE_STRING );

		if ( $post_type ) {
			$post_args['post_type'] = $post_type;
		}

		$orderby = sanitize_sql_orderby( filter_input( INPUT_GET, 'orderby' ) );
		$order   = esc_sql( filter_input( INPUT_GET, 'order' ) );

		if ( empty( $orderby ) ) {
			$orderby = 'date';
		}

		if ( empty( $order ) ) {
			$order = 'DESC';
		}

		$post_args['orderby'] = $orderby;
		$post_args['order']   = $order;

		$search = esc_sql( filter_input( INPUT_GET, 's' ) );
		if ( ! empty( $search ) ) {
			$post_args['s'] = $search;
		}

		return new \WP_Query( $post_args );
	}
...