I dunno, a better lesson to take away from this is, don't fall for sales. I think more people will do better to learn to evaluate others by what they do rather than what they say. If you don't know better, reputation and first-hand references will give you much better indicators than someone's own words.
This guy had the sales chops and the ability to write good code (as pointed out in the tweets). Sounds like the complete package.
If that were the case, the sales wouldn't have mattered in the first place. The article does suggest cold emailing as a tactic, so if someone is looking at a stock standard cold email template and thinking, "hey, this guy sounds exciting!", they're gonna have a bad time.