Because he's like the 1000's of other "growth hacking" scam artists who's selling courses about his own company that sells courses, and tweeting about building a twitter audience. It's completely ridiculous circular nonsense.

Take advice from people who actually made a company and actually built stuff that served users, not people who sell courses about selling courses or whatever, or making a splash about making a splash. I don't care he claims he was an engineer at some point, that's basic stuff.