It is not wrong though. Once you reify the return continuation, a continuation is really just a closure, the stack is implicitly recovered by recursively following the captured return continuations. And with closures you do not necessary have a stack anyway but any arbitrary directed graph.
Yes, but if you take 'stack' too literally here then you'll think that `call/cc` copies the stack, when maybe it really doesn't.
> Closures capture variables.
Variables, yes, including the return address of the frame in which those variables are if that return address is make explicit (e.g., because of CPS conversion).
And now you can see that closures can be continuations if they implicitly capture the stack.