ACF Rule - Oxygen Templates

<?php

if ( ! defined( 'ABSPATH' ) ) exit;

class Digitalis_OXY_ACF {

    public function __construct() {

        $this->add_filters();

    }

    private function add_filters() {

        add_filter('acf/location/rule_types', [$this, 'location_rules']);
        add_filter('acf/location/rule_values/oxy-template', [$this, 'location_values_oxy_template']);
        add_filter('acf/location/rule_match/oxy-template', [$this, 'location_match_oxy_template'], 10, 4);

    }

    public function location_rules ( $choices ) {

        $choices['Oxygen']['oxy-template'] = 'Oxygen Template';
        return $choices;

    }

    function location_values_oxy_template ( $choices ) {

        global $wpdb;
        $templates = $wpdb->get_results(
            "SELECT id, post_title
            FROM $wpdb->posts as post
            WHERE post_type = 'ct_template'
            AND post.post_status IN ('publish')"
        );


        if( $templates ) {
            foreach($templates as $template) {
                $choices[ $template->id ] = $template->post_title;
            }
        }

        return $choices;
    }

    public function location_match_oxy_template ( $match, $rule, $options, $field_group = false ) {

        $current_template = get_post_meta( $options['post_id'], 'ct_other_template', true );
        $selected_template = (int) $rule['value'];

        if($rule['operator'] == "=="){
            $match = ( $current_template == $selected_template );
        } elseif($rule['operator'] == "!=") {
            $match = ( $current_template != $selected_template );
        }

        return $match;

    }

}

new Digitalis_OXY_ACF();