Basically, Master Tengen says that Kenjaku created the current "Chaos" via his cursed energy, and only didn't spread chaos of curseds throughout the Japan because Kenjaku lacked cursed energy. Later it is proven that Tangen is referring the "Chaos" to the blackout when he compares Kenjaku's feat to what he can do if Kenjaku uses Tengen's body (Saying that everyone on the world will be affected).
Everything I said is accepted, but we don't accept it as a legitimate feat because it was considered a chain reaction via Kenjaku needing to destroy the barriers. But in fact, the barriers have nothing to do with the blackout.
Barriers are only illusions and portals, it makes no sense to consider the blackout a chain reaction via the Tangen barriers. The reason Kenjaku created the blackout was to cause the chaos of the curses and get his plan finished quickly