There should have been a line in the article that explains that Vegas was written to work with older nVidia cards based on their Fermi architecture and not with the later Kepler, and now Maxwell architectures.
I have made it a little more clearer with this line:
"Sony says you can use NVIDIA video cards and use CUDA acceleration, however, that is only with the older GTX200, GTX400 and GTX500 series of NVIDA video cards. The newer GTX600, GTX700, GTX900 series are not supported for CUDA acceleration."
At one point I did have a line about the Fermi, Kepler and Maxwell architecture, but I was getting a lot of emails from non-technical people. So I had changed it back to just using the video card numbers, like GTX-500 series, GTX-600 series, etc.