The original problem exists as it was. You can visit that Discourse installation on the same IP address as mentioned in my orig post. There are no guides for Google Cloud Bitnami Implementation. And Meta Discourse forum doesn't help at all when there is 'Bitnami' mentioned anywhere (or Google Cloud). But somehow I succeeded by trying from Digital Ocean guide.
Yes. I succeeded installing Discourse by trying very hard (there are no guides for Google Cloud) from Meta Discourse. But its not a bitnami installation. Bitnami is giving problems as it was doing earlier. Pls visit the ip mentioned. I've used that domain name with my new installation, I can attach another domain, if you want to look into the problem.