Re:Help config HC working on Centos google compute
Try to configure the same Public IP on your Google Cloud VM in HC panel as well. After it, your website should be browsed.
Also, please make sure that you have specified the default document for this website in HC panel from : "Hosting Services :: Manage Websites :: My Websites :: Website Properties :: URL Redirection". If problem persists you may discuss it in a ticket with the support dept.