There is better documentation of what to do provided by Avid in the usual place.... the Optimization and Troubleshooting guides. But not so easy to find.
A mass of information:
https://avid.secure.force.com/pkb/ar...oting/en367983
What you want is in here:
https://avid.secure.force.com/pkb/ar...ide#delete_pro in the section titled "Delete Pro Tools Databases and Preferences".
And you should have read that guide as part of optimizing your system properly, if not then have a read.