In the article announcing the banning, Wizards suggested that it was willing to see if players would tolerate a "skill-testing, one-deck metagame." As such, it seems that a deck being 75% of the format doesn't automatically necessitate a banning
The gist is that, after the events of Stormblood, the world of Hydaelyn is on the precipice of an apocalyptic war orchestrated by the evil Ascians, immortal beings who want to see the world plunged into chaos as a means to revive their dark god
On turn one it can even snag a Dredger's Insight
Chaos: Whenever you roll Chaos, double the number of age counters on The World Tree, then create an X/X colorless Titan creature token, where X is equal to the number of age counters on The World Tree
For six converted mana, this 3/6 enters the field with hexproof from artifacts, creatures, and enchantments
Stern Scolding isnt an auto-include in every cEDH deck, but it does have utility