Good old email spam rebranded from crime to Killer Sales Strategy. I receive lots of emails from such startupers, they send me lots of junk every day only because I registered somewhere long time ago. Not much better than penis enlargement.
I can't comment for everyone but I spend a significant amount of energy filtering out all advertisements in email. Honestly, for me, there's more business potential in helping me to stop receiving ads in email than to sell me something through it.
It's funny that the article includes "you’re setting yourself apart from the snake oil peddlers of the world" as the writing and the surrounding web page makes me think of it as nothing other than snake oil.