I think GP is saying that we need _different_ education, not necessarily "more". It could be more if the new stuff was added in, or it could be the same amount if it replaces something else. The total amount of education isn't super relevant, and it's a bit misleading up claim that teaching anything other than what is already part of a medical school curriculum means you're requiring students to learn "more than a doctor".
For a more concrete example, I have never gone to graduate school; my education ended after finishing my undergrad. By any reasonable measure, I received "less" education than a doctor, who presumably completed an undergrad like me but also medical school afterwards. However, I almost certainly learned certain things that most doctors didn't in my computer science education, like how a compiler or operating system is written. If instead of those computer science courses I took courses dealing with media literacy and how to recognize bias, I still would have "less" education than a doctor.
