It's meaning is not that the contents are not safe for work - it means that Paul Carr himself is "not safe for work", having been fired from every job he's ever had.
Amazes me that on every single one of his articles, the top-voted comment is always "why is this NSFW????"
By the way, if you haven't read it, Paul Carr's book is really quite excellent, especially for budding entrepreneurs; I highly recommend you check it out.
So, at least for the folks who don't subscribe to every hip, new, social media blog, these comments are useful.
But seriously, is this just a link-bait title because the author gets paid per page impressions?!
A bit "meta" and ironic, like how certain rock bands used to call themselves suggestive names to lure people into venues.