Posting to a blog about a first round of interviews while you are still going through them can easily be viewed as premature, immature, and potentially dangerous for the company (but moreso for the reputation of the poster).

Now, if he had been hired, worked hard for a couple of years and was promoted from within the interview story could be considered relevant advice. However it is too early for anyone including himself to glene any pro/cons out of it, and instead the blog post looks like a kamikaze mission to the top of the hill to let his buddies know where the enemies are hiding.

An interview is a private interaction; making it public is what some see as poor judgment. If it were the company blogging about every candidate they interviewed, I suspect that would be received in a similarly negative light.