No, it's still not as straightforward as that. There is an expectation that you actually deliver interesting, engaging, innovative lessons. Rocking up and reading out of a book and asking for analysis isn't deemed an acceptable standard of teaching.
Understanding something and delivering it to children in a way which is accessible and makes them actually want to learn are totally different things. You can have a PHD in rocket science and still be useless at teaching 7 year olds about gravity.