It doesn't actually break any rules, to be clear. @Agent23 is changing just his experience on the site, and not seeing anything he shouldn't get access to (in fact, he's making it so he has less access). This is definitely allowed.How wonderfully pathetic. Probably breaks some rule, too. At least most boards have a rule that says you can't ignore mods and admins, anyway.
Understand though, he is still bound by rule 3 to obey the mods, so if Marduk makes a mod post, and Agent doesn't see it because of this and thus disobeys it, that's still breaks the rules just as much as if others do it having read the post.