This is basically the next year's model to one of my laptops, which I still use, which I am typing on right at this moment - a Latitude E6420...
Mine, BTW is a "base" model, one with only a blank space on the system board where the Nvidia or AMD GPU would have gone.  Yours will still have the Intel GPU.
Here is the way to properly disable an Nvidia GPU which also has a companion Intel GPU, I have even made it into a bash script, if you wish to keep it:
#!/bin/bash

# https://bayas.dev/posts/turn-off-nvidia-udev



sudo tee /etc/modprobe.d/block-nvidia.conf << EOF > /dev/null
blacklist i2c_nvidia_gpu
blacklist nouveau
blacklist nvidia
blacklist nvidia-drm
blacklist nvidia-modeset
EOF



sudo tee /lib/udev/rules.d/50-disable-nvidia.rules << EOF > /dev/null
# Remove NVIDIA USB xHCI Host Controller devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c0330", ATTR{remove}="1"

# Remove NVIDIA USB Type-C UCSI devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c8000", ATTR{remove}="1"

# Remove NVIDIA Audio devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x040300", ATTR{remove}="1"

# Remove NVIDIA VGA/3D controller
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x03[0-9]*", ATTR{remove}="1"
EOF

To undo, just remove the two files created in the process:
/etc/modprobe.d/block-nvidia.conf
/lib/udev/rules.d/50-disable-nvidia.rules