There's no need to uninstall and reinstall the game since the only issue that you have us you can't connect to the game servers. As for the steps in the link, I already tried them they worked. Some players also used those steps and it also resolved there issue.
A support case was created for you and you should be contacted shortly by a Customer Support Representative, if you haven't been already. You can view and update your case at the Activision Support website. After logging in, go to "My Support" then "My Cases".