I am responding to the comment, not the article.

The concept of Khanmigo was great. The implementation was basically useless.

It was a great attempt, but the article explains the problem:

"early OpenAI access"

This was literally the world's very first attempt at an agentic tutor, with (initially pre-release) GPT-4. That is worlds away from what's being built with fable or sol-grade models in 2026, or what will be available in 2028.