I think his point was that there's a lot more to a business than just shipping the product, although it's obviously incredibly important to do that well.

Marketing and sales is what makes a business at the end of the day, and if I was a "business guy" that's what I would spend 100% of my time focusing on, not wasting time reading tech/vc blogs.

Facebook, Groupon, and PlentyofFish wouldn't be where they are today if their founders were just hackers with zero marketing instincts.