I don't understand this rationality quote. Is it about fighting akrasia? Self-hacking to effectively saving money? It clearly describes a method that wouldn't actually work, and it could work as humour, but what does it mean as a rationality tale?

It could be used as an effective "How to create an Ugh Field and undermine all future self-discipline attempts" instruction manual. It isn't a rationality tale. It is confusing that 40 people evidently consider it to be one. (But only a little bit confusing. I usually expect non-rationalist quotes that would be accepted as jokes or inspirational quotes elsewhere to get around 10 upvotes in this thread regardless of merit. That means I'm surprised about the degree of positive reception.)