I assume that your host is Windows as well. I posted a workaround
in the same thread that you referred.
Probably disable the HD 630 (if it is enabled) either through the EFI or Device Manager as there seems to be no way to make the Nvidia GTX 970 the default render device (in Nvidia Control Panel) for desktops. And once you switch over the GLRenderer in the vmx, I am not aware of a vmx edit to specify that the GL Render device should be the Nvidia adapter. Using the Intel HD device for VMware GL rendering on Windows hosts looks problematic.