https://techcrunch.com/2018/05/18/what-we-know-about-googles-duplex-demo-so-far/

The highlight of Google’s I/O keynote earlier this month was the reveal of Duplex, a system that can make calls to set up a salon appointment or a restaurant reservation for you by calling those places, chatting with a human and getting the job done. That demo drew lots of laughs at the keynote, but after the dust settled, plenty of ethical questions popped up because of how Duplex tries to fake being human. Over the course of the last few days, those were joined by questions about whether the demo was staged or edited after Axios asked Google a few simple questions about the demo that Google refused to answer.

We have reached out to Google with a number of very specific questions about this and have not heard back. As far as I can tell, the same is true for other outlets that have contacted the company.