I don’t agree it undoes ROTJ’s conclusions any more than the onward march of time “undoes” the actions (and the meaning behind the actions) of the people who fought (and died) for things in the past.
When the allied powers won the war and created a peacetime, History didn’t continue with Zombie Hitler reinstating the Axis Powers tenfold and starting World War 3 in the 1970’s
The analogy worked when the OT war was WWI, which was supposedly, infamously, “the war to end all wars.” The ST is then WWII.