I suppose so.
I am pretty sure that I've violated this rule in every one of my stories so far, and I didn't include an email address, either. I'm curious to know if that means that plix would have thrown them away. He might even throw them away retroactively.
After all, these rules are guidelines of the minimum variety, like lines at the side of the road that show you were you will go crashing and burning into the ditch if you wander past. Following these rules is not a goal to be achieved where getting closer is better: minimum means that anything that does not completely comply is less than acceptable.
In fact, if these are going to be the rules, then my stories should be taken down. I'm making it clear right now that they violate rule 4, so there is no reason why the rules should not be applied retroactively. It might even have happened already, since I didn't give an email address and won't be getting any notification.