The Revo uninstaller tool probably works in most cases but there must be cases where it doesn’t work. As Tobii wrote their own software they would be in the best position to know how to write uninstaller software for their own programs. When you contact support (like I did when I had a problem with the Tobii Runtime Service stopping on every boot) one of their troubleshooting steps they ask you to do is to do a clean uninstall with their custom uninstaller software.
Steps 1-34 as detailed here in this post:
https://forums.flightsimulator.com/t/settings-setup-guide-for-the-tobii-eye-tracker-5/502973/10
actually fixed my problem.