Because I trust the reporters at RFA and RFA's long-earned reputation not to select Sally the receptionist as a credible source. That's the difference between bloggers and journalists.
That's why I want to know who this person is, and why I asked the critic for more information about him. I trust RFA more than I trust some rando commenter on HN.
About as believable as when Sally at work says there's layoffs coming - but she's the receptionist.