Yes it can be told not to upgrade, and I'll add this to the tutorial
Here's how...
Uninstall the new version, and install the non-Aura version (as described in the downgrade tutorial.
Then once you're sure you have the non-Aura version, run:
sudo echo "google-chrome-stable hold" | sudo dpkg --set-selections
to lock the package at the currently installed version
If you run an "apt upgrade" or an "apt dist-upgrade" it'll inform you that google-chrome-stable is being held back ;)
to unlock it (should you ever WANT to let it update):
sudo echo "google-chrome-stable install" | sudo dpkg --set-selections