A little follow up info from Jesse.
Unfortunately Microsoft does not provide a Mac driver for their SDK and only libfreenect2 can be used on Macs.
On a mac you are unfortunately limited to the Kinect 1 joints. If you have access to a Windows PC you could try using NI mate on it.
I received this response from Jesse at NImate:
'With the hands turned off they aren't supposed to be outputted. It's possible it's a bug. You can force disabling them as follows:
Enable the hands
Clear all the fields for the finger joints
The fields should no longer be outputted
Chest and Pelvis are specific to Kinect for Windows v2 Microsoft SDK, I think. Other sensors as well as libfreenect2 won't output those joints.'
So sadly this FR is redundant, NImate with Kinect v2 running on a mac does not output the extra joints as expected in the first image in this thread.
You only get the same points as with the V1. NImate on Windows should output the extra points.