When any law enforcement officer in the USA starts asking you questions, become EXTREMELY cautious and serious (even if they do not explicitly state the warning, which they might just say afterwards to cover themselves). People often think they can "talk themselves out of it", and almost always discover that is not the case.

However, Miranda rights are mostly about the right to avoid self-incrimination. In the article he seems to suggest that the officer must present identification or credentials as part of Miranda, which is not something I'm familiar with.