Is conceptually correct to access DB from Controller?

This is more a conceptual question. I am learning MVC and I recently watched a video that supposed to show how to implement a simple CRUD by using the basic query builder methods. Everything was doing well when he called the method save() directly from the Controller.

Maybe I just didn't get correctly the philosophy behind the MVC but it looks totally odd to me.

What am I missing here?

Recovering the wasted time...