Well, I would start by telling my customers that I have this great course and it's going to cost X dollars. I would also say what this paid course entails, what the chapters are, what I am going to learn etc. Instead, he is offering a "free email course" and only at the very bottom of the page, in gray font, he does say that there will be an option to buy a paid version at the end. No price, no details, absolutely nothing. That's something that I wouldn't do.

Those who might consider your paid course would only have the persuasiveness of your sales site to go off of. By offering a free email course, you're able to figure out whether Paul's capable of providing you value. If he is, he'll have a call-to-action that upsells you on his paid course which provides even more value.

There's nothing at all wrong with this formula, and IMO it's much "safer" for the buyer.

There's a big ol' "Brought To You By" link at the bottom of the page that links to exactly the type of page you're describing, complete with a very well done explainer video.

It's almost as if this course isn't for you, and you've self-selected your way out of wanting it. Fancy that.