In that case the poster originally thought that the email address used was the private one used to connect with HN. They didn't realise, and hadn't intended, t

In that case the poster originally thought that the email address used was the private one used to connect with HN. They didn't realise, and hadn't intended, that it be accessible via their public profile. If their suspicions had been correct then there would somehow have been a breach in HNs security. But they had, inadvertently, made their intended-to-be-private email available in their profile, so everyone thought it was all a misunderstanding. Hence the flagging.