Revivals do not count on threads which are on a user's message wall, though users should be considerate. Remember, some people have email notifications on. Is it worth posting what you are posting and do you think the person will be okay with it?
If a user has revived a thread, be helpful. If you're going to point out that a thread has been revived, then you should also guide the users to the forum rules. The wiki's forum along with the rules can be found under the "COMMUNITY" tab. Alternatively, you may type the following as a response which will automatically guide the user: