The fourplex exercise worked because it made the gap empirical rather than moral. That is the right move. The assumption doing the most work in your post is that the four-month pause reflects a change in belief rather than a temporary loss of momentum. Those are different problems with different trajectories.
People who cycle through courses are usually solving for something other than real estate returns. The courses deliver certainty, community, identity, and a sense of forward motion without the exposure of an actual deal. That bundle is genuinely valuable to someone who is afraid of making a wrong decision with real money. More information does not fix that, which is why $23,000 of it has not.
What tends to move people further along is repeated exposure to the decision architecture of real deal-making, not just the mechanics. Your fourplex walkthrough started that. The next step is giving him a role with stakes, even small ones. Something like asking him to underwrite a second deal you are actually looking at, with a deadline, and treating his analysis as real input. That creates accountability and a concrete artifact he produced, which is harder to dismiss than a course certificate. The risk you have not named is that if he jumps back into a program before he gets a win of any kind, the pause resets and the identity around being a student consolidates further.
Getting someone fully out of the cycle usually requires them to experience a version of doing the thing, so the student identity has somewhere to go. Without that, the pull back toward courses is strong because the alternative is just sitting with uncertainty.
What is his stated reason for not closing anything yet? I am trying to figure out whether the block is analytical, financial, or something else entirely.