Always good to have a healthy skepticism about what you read online, so I can certainly appreciate why you're suspcious of me.
I will note, if you had clicked the link you reference, you'd have seen that I'm by no means some anonymous, Internet infogypsie (though I love that term and am absolutely going to start using it). I also don't sell any courses... or any of my content. It's all free.
To be fair, I suppose the university I teach at does sell my courses, and they pay me, but those are different courses than what I've personally posted online.