PHP: Use page_template within pre_get_posts

page-template-pre-get-posts.php

<?php

add_filter( 'pre_get_posts', 'wps_archive_query' );
/**
 * Add more query args based on selected page template.
 *
 * @since 1.0.0
 *
 * @param <type> $query
 *
 * @return <type>
 */
function wps_archive_query( $query ) {
	
	if ( is_page() ) {
		if ( 'page-stats.php' == get_page_template_slug( $query->queried_object_id ) ) {
			$query->set( 'post_date', date( 'Y-m-d', strtotime( '-30 days' ) ) );
			$query->set( 'post_type', 'my_cpt' );
			$query->set( 'orderby', 'comment_count' );
			$query->set( 'order', 'ASC' );
		}
	}

}