You missed this bold part from the guide.
To use the database you must first register on the site, then email, or open a ticket to have your access updated to allow you to edit the information.
The database is manually exported to GitHub periodically, usually at least once a week. After that, the OH snapshot build process builds a new binding with the changes.
You can then use the manual install script to install the updated binding on your system,
You then need to delete the Thing from OH (do NOT exclude) and re-add to get the new settings.