The “Schlieffen redux” was the original plan to attack France in 1939/1940.
The “left hook” running the panzers through the Ardennes was the “radical” plan. Nobody expected the French and the Brits to cave so fast.
The left hook isn’t a radical departure of the Schlieffen plan. It’s a part of the plan.
They followed pretty much the exact same course they did in ‘14, except that they were able to execute the maneuvers properly with tanks and mechanised forces.
What was radical is rolling them through the Ardennes because the school of thought was that they were impassable to tanks.