That article only turns Copilot off, does not remove it.
There is a note in that article:
Note: If you want a plan that doesn’t include Copilot, there is
Microsoft 365 Basic or
Office Home 2024.
It also says that you have to quit your MS App, then relaunch the app, so that Copilot will then be turned off (along with other features that are part of those privacy settings.
Are you saying that Copilot does NOT turn off after changing those settings, then restarting Word?