That is indeed needed.
I think the best would be to chroot into your installation.
Then removing EVERYTHYING nVidia related. I think with
sudo pacman -R $(pacman -Q | grep -i nvidia)
After that, reinstalling the nvidia drivers and things. I think with:
sudo pacman -S video-nvidia
Once again, I THINK this is all the steps and you can reboot. But if there are any other instructions, follow them. I don’t know if I forgot something, and it is quite possible, seeing as I’m not perfect, but I think this is it.
Also, take note:
Take note that your GPU’s driver hasn’t been dropped. Then you’ll either need to compile the drivers yourself, using these instructions, or switch to the free drivers.