Nowadays there is a lot of talk about "inclusion". What about "including" people who dislike profanity? "Don't mess up the culture" would have conveyed the same message without the bad language.
For someone who wants to have a certain level of professional decorum at work, the use of "fuck" in your CEO's blog post about your company's culture would certainly be exclusionary.
It's also quite likely to drive away even-tempered contributors in favor of a "bro" audience.
Perhaps that was the point: http://www.glassdoor.com/Reviews/Airbnb-Reviews-E391850.htm
To put it in a way that Ben might understand, it's fucking bullshit. It's not the worst part of the book to be sure, but there's no value to it, the reasoning is weak, and the evidence is non-existent.*
* The worst thing is when he espouses the importance of work/life balance for the CEO, and then talks proudly of a death-march that he put his employees through. A death march which he says must be good because a grand total of one employee told him it was a great experience. A death march which didn't result in the loss of all his employees not because Ben is a great leader (he ain't), but because the economy was such a catastrophe that even a shitty, abusive job working for a profane and self-congratulatory motherfucker was better than the alternative.