As someone who’s hired many dev advocates, I definitely value the ability to turn mundane topics into posts that hit the HN front page. If they can do this about something as dull as failing interviews, imagine what they’d do with an actually interesting technical topic.
Failing interviews is a favorite topic for HN, not a "dull" one; this is not the only person who's made the front page about it, and certainly won't be the last. HN's audience contains a large group that believes "tech interviews are stupid and broken" and this is right up their alley.
I don't think it is a strong signal of an easy pivot to influencer-as-a-career.