The quoted rule seems to come from the Plex.tv. And the forum threat said first four rules are irrelevant these days.
The first 4 ‘rules’ generally are no longer as important as they once were, but may still be a good thing to bear in mind.
And I want OP to know that
shame that most x265 groups microsize the releases or use the x264 as source what results in low quality releases. And the few groups that do use the correct source suffer from it.