I'd say that's more of a selection bias that bullshit. The only companies blogging about interviewing are the few ones that actually have made a conscious decision to deviate from the norm (regardless of the reasons).

It's like if you were trying to evaluate the average math proficiency of the population by only reading blog posts about math. It would seem like everyone really knew math! Except of course, the only people who blog about math are the few that are into it. They're not bullshitting, they're just overrepresented.

Not that I disagree with your original point, by the way; BS is rampant.