> otherwise you may think that testing and the static analysis performed by a compiler are interchangeable. They are not

I agree with you, but I think this is the issue. A lot of people used to working in dynamic languages spend time writing up lots of tests for things that get covered “automatically” in statically typed languages, leading to the confusion you note. This, I’d argue, effects people who “convert” to liking the static language, and to those who think static lands cause only overhead.