Yeah I found that part especially wrong too. His article is all about fairness, and it seems especially unfair to me that someone would work and have a huge chunk of compensation deferred with a nontrivial chance the company never pays.

If I work for someone, they need to compensate me right away. This may mean I receive an option grant that is eventually worthless, but at least in that case I would have had an upside to my risk. The IOU has no upside but has the same possibility of worthlessness.