I do not understand what you mean by ‘SATA power supply’. Here’s the background:
In the past, the Kinect V2 did not work with the USB 3.0 port on the Jetson TX1 due to USB driver issues. As a workaround, people were using PCIe USB 3.0 cards, such as the one recommended in the OpenPTrack install page:
The card is powered by the PCIe bus.
With NVIDIA supplying a patch to fix the USB driver issue, the built-in USB 3.0 can be used without the need for an extra PCIe card. As you noted, libfreenect2 works now as demonstrated by the Protonect example.
From the OpenPTrack installation page:
you should be able to get through Step 13 successfully.
Were you able to complete Step 14?