Please help here

No, because the first line indicates that he is still living here.

Anonymous Alex: Has Jack been living there for eight years?James: Yes.Alex: Is he still living there?James: yes.Does the conversation make sense?

I believe CJ has already answered these questions previously with detailed explanation and examples.

Thanks a lot. But my confusion is here,
Jack: What have you been doing for the past hour?
Alex: I have been wiping the windows.
Here in Alex's sentence, it does not say Alex is still wiping the windows? Why is that cause they both are present perfect continuous?

Anonymousit does not say Alex is still wiping the windows?

I think it does say he is still wiping the windows (possibly finishing up just seconds before the exchange).

I think you need to go back to CJ's last post on the questions and review his extensive explanations. If you can't see the light with CJ's examples, chances are, you won't find another expert to help you understand. I personally see that you are making perfect continuous harder than what it is. For what it is worth to you, this is my rule of thumb. From a listener's perspective, if I hear someone