tried it and couldn't really tell between a good prompt to "teach me" and this.

In the blog post they say as much that it just is a system prompt. Still nice to have easy access, and for more users to discover that use case.

same. i can't tell whats different. gives me same output regardless for the prompts in the example.

i don't get it.

Highly analytical 120 IQ HNers aren't the target audience for this product. The target audience is the type of person who lacks the capacity to use AI to teach themselves.