To be fully fair, the sincere mea culpa does still occur sometimes and we've even seen it here on HN with some startups/founders who fucked up, but it happens so rarely now that when I see those exceptions that prove the rule they are surprising, which is sad.
Ignoring the human element, this sort of non-apology response isn't even a good strategy if you look at things in a purely Machiavellian way. "Yeah, sorry, I fucked up, I'll fix this" gains you a bunch of goodwill, repairs reputation and trust (so long as you aren't fucking up constantly). OTOH, the typical "Nah, I wasn't wrong, here's why you're wrong to think that" or "I'm sorry you were offended by the thing I did" response does nothing but make you look like an immature ass, so why pursue this strategy? Even in borderline cases where you still think you were kind of right, just fucking apologize and move on! It is clearly the +EV move.
As a non-subscriber to The Information I previously had a fairly neutral view of them as I just sadly sort of accept selective misquoting as the way things work now, but reading this "How We Operate" thing skewed my view harshly negative.