You don't have a theory to answer that. The article writer does. In their view, learning is a social activity, and kids don't like to sit in a room with dozens of others each with their own personalized algorithmic "teacher".
That's not really all that surprising. If it was only about personalization, it would be easy enough to do that with far simpler technology than modern computers.
The article writer's theory also neatly and immediately suggests an explanation for why personal tutoring still works, when automated custom tutoring manifestly hasn't so far. That's because it is social. Even if it's just you and your overworked homeschooling parent, you care because they care.
Personalization isn't key. Personalization from a tutor works because it's hard and costly, and convinces the student that this matters.
That's just a theory. It's not necessarily right, but it does present a convincing explanation for what we observe, and in particular the observation worth repeating, that no one can seem to get algorithmic personalized education to work, no matter how rich and clever they are.
And from my personal experience with teachers (including my parents) I have often heard from them that the challenge isn't explaining, it's to get the students to care.