There is no secret cut. He put out exactly what he wanted to put out. Nobody made him edit the movie the way he did. He did that on his own.
Source?
There do exist movies which were meddled in and/or extensively recut by parties other than the original director(s). Hell, we know 2 of the five newest Star Wars movies got this treatment. Granted there’s no solid evidence that this is what happened, but the alternative is that important pieces of the plot for TROS were cut because…it made a better movie?
Nobody really knows what went down on TROS, but if you see a body with dozens of stab wounds and severed limbs, maybe hesitate before calling it self-inflicted.