You'll notice this mentions the "tactics" section of a monster entry exactly nowhere. Are we also to conclude that a fight with two Balors requires special EL adjustment, since that's not a listed value for their "organization" entry? You'll even note that it quite clearly says "circumstances", which is a different word from "tactics".
The really weird thing is that the conclusion of this argument is that it's totally fine for a 5-Int Dretch to do whatever the DM wants with no adjustment to EL, but cheating for a Balor to do so, because the latter has a tactics section and the former does not. If Psyren were arguing about some specific set of tactics, he might have a point, but the blanket "only the listed tactics count", when that is demonstrably not the way the designers used the monster is just puzzling.
That's only sort of true. The original Cleric Archer (the ancestor of CoDzilla) predates 3.5. Plenty of people understood how to play effectively from the beginning (the first 3.5 shapechange infinite loop predates the printing of 3.5 shapechange), it just took a long time to break through the people who strenuously insist the Fighter is fine to even the degree it's happened today.