Reverse proxy functionality through Dispatcher (Apache) is still supported in AEM as a Cloud. However, AEM as a Cloud now also supports the 'originselectors' feature via CDN, allowing connections to non-AEM servers (reverse proxy requests to different origins). Utilizing this feature through the CDN offers numerous benefits. For more details, please refer to the 'Configuring Traffic at the CDN | Adobe Experience Manager.
Regards,
Albin
https://myprofile.albinsblog.com