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

constructor.php

<?php
...
	/**
	 * Draft_List_Table constructor.
	 */
	public function __construct() {

		parent::__construct(
			array(
				'singular' => 'Draft',
				'plural'   => 'Drafts',
				'ajax'     => false,
			)
		);

		$this->allowed_post_types = $this->allowed_post_types();

	}
...