Please read https://news.ycombinator.com/newsguidelines.html, which ask you not to snark or to post shallow dismissals.

A good version of this comment would explain what's wrong with the original idea, so that readers who don't know could learn something.

Physics taught me that all pulleys are frictionless.

Mechanical Engineering may find some issues with it though...

Or you both can consider stepping down from your high horses. It is a fun tongue-in-cheek idea, and the author explicitly mentioned the need for a gearbox. I am teaching physics and I will probably use this example in a lesson soon, because it is actually interesting to discuss why this idea would not work in practice (in principle all you need is indeed just a perfect gearbox).