Modifying Repeater Query from Oxygen for a Particular Custom Post Type

EventQueryMod.php

<?php
/**
 * Modifies event listing.
 * 
 * @package scorpiotek-wordpress-utilities
 *
 */

namespace ScorpioTek\WPUtil\Events;

class EventQueryMod {

	private $custom_post_type_name;

	public function __construct( $custom_post_type_name ) {
		$this->custom_post_type_name = $custom_post_type_name;
		add_action(
			'pre_get_posts',
			array( $this, 'go_loco' )
		);
	}

	public function go_loco( $query ) {

		if ( empty( $this->custom_post_type_name ) ) {
			return $query;
		}

		/** This will work for regular post archives. */
		$post_condition = $query->is_post_type_archive( $this->custom_post_type_name );
		/** This will work for Oxygen queries. */
		if ( ! $query->is_main_query() && ! empty( $query->query['post_type'][0] ) && 'sb_event' === $query->query['post_type'][0] ) {
			$post_condition = true;
		}

		if ( ! $post_condition ) {
			return $query;
		}

		// Avoids infinite loop.
		\remove_action( 'pre_get_posts', array( $this, 'go_loco' ) );
		$events_per_page            = get_field( 'events_to_display', 'options' );
		$events_sort_order          = get_field( 'event_sort_order', 'options' );
		$events_archives_per_page   = get_field( 'event_archives_to_display', 'options' );
		$events_archives_sort_order = get_field( 'event_archive_sort_order', 'options' );
		\add_action( 'pre_get_posts', array( $this, 'go_loco' ) );

		if ( ! is_admin() ) {
			$date_now = ( new \DateTime( 'now', \wp_timezone() ) )->format( 'Ymd' );
				/** Default to upcoming events. */
				$compare = '>=';

				if ( isset( $_GET['archive'] ) && 'true' === $_GET['archive'] ) {
					/** We need to get everything older than today. */
					$compare = '<';
					$events_per_page   = $events_archives_per_page;
					$events_sort_order = $events_archives_sort_order;
				}
				$query->set( 'posts_per_page', $events_per_page );
				$query->set( 'meta_key', 'datepicker_event_start_date' );
				$query->set( 'orderby', 'meta_value' );
				$query->set( 'order', $events_sort_order );
				$query->set(
					'meta_query',
					array(
						array(
							'key'     => 'datepicker_event_start_date',
							'value'   => $date_now,
							'compare' => $compare,
						),
					)
				);
			}
			return $query;
		}
}