I don't think he did anything wrong. It's a
cold email after all. Imagine you get an email from an unknown entity and they say "Hey there my name is X from company Y and I'm not selling anything but want to learn more about the problems folks in your industry may have to better serve my current and future clients".
Now, you're a busy business owner/decision maker and lots of people want a piece of you. You're inbox is always filling up with junk and even the non-junk you often don't have much time for. So assuming you even decide to read past the first sentence, if at all, you might decide that you'll write back but not right now so you mark the email as unread but never return to it as the inbox just keeps filling.
That's a best case scenario in my book. Others probably delete the thing immediately and those who open it and read it may wonder if there's a catch because no stranger gets in touch with your business unless they either want what you sell or want you to buy from them. A "I'm-not-selling-anything" email may reek of deception to a lot of people. I know it does for me.
Even with cold calling getting 1 in 50 is a success. I think you're being too quick to judge here. I think he did a great job and I think he's actually be a little hard on himself to be perfectly honest. I'm always reminded of Roosevelt's "Man in the Arena" speech when I hear these kinds of stories. On the outside it seems like a failure and it's all too easy to criticize but the man in the arena is to be respected even if he fails miserably because in this world so few people even have the balls to enter the arena in the first place. We live in a spectator society. Most people are armchair quarterbacks and eventually the ones with the balls to try something brave or dumb or risky are rewarded so long as they keep going.