CUDA is definitely still broken. The common causes of this that I can find are:
- overly aggressive antivirus/security software
- CUDA disabled in NVIDIA Control Panel
- UAC disabled during install resulting in a bad driver install
- bad/corrupted driver install
- corrupted OS files
- faulty hardware
You can try disabling your antivirus/security software temporarily and re-running the driver installation normally to see if that changes anything in GPU-Z. If it doesn't, check the NVIDIA Control Panel for the CUDA setting (I think it's under Manage 3D Settings). If that doesn't help, check for PC BIOS updates. If that doesn't help, go through the DDU process again, but for both Intel and NVIDIA, and make sure Norton isn't enabled while running the installers (it shouldn't be enabled if you're in Safe Mode anyway).
If all that fails, I might be out of ideas. Of course, you could also use x264 instead of NVENC if you need to immediately record/stream, but that doesn't solve the underlying issue here of your NVIDIA GPU having features disabled.