Believe it or not, I don't need you to explain these things.

I was asked to. "Now try and replace all the information conveyed". The presumption was that I believe there was a need to do so. I don't, so I explained what I believe.

It's a statement about what doesn't happen, not about what does.

One doesn't speak about what doesn't happen for its own sake. It's done to explain what does happen or what should happen.

In this case, we have a misleading statement used to explain what happens when expressions are placed in scalar context. Therefore, that's what the replacement needs to explain.