No one really agrees on the exact terminology. There are stackful and stackless coroutines, continuations, green threads, fibers, cooperative threads, etc. Generally when people talk about coroutines without a qualification they are meaning the stackless variety. I personally consider a coroutine with a stack frame to be a cooperative thread, but understandably not everyone will agree on naming. The nomenclature hopefully should not affect the broader message of the article though.

In any case, I am not so much trying as I already have. C++ does not have stackful coroutines. I implemented them via my libco library and have been using them for over a decade now.