Not to be argumentative, but I think that is a matter of perception more than any solid evidence that they addressed it in any way, shape or form. I have the latest update and my auto-dimming is every bit as aggressive as ever - Just the other day I tested this by reverting my settings so as to not use the workaround (really all you have to do to check this is drop the brightness down to 46, play something preferably with alternating shots of dark and bright scenes, and pull up the on-screen menu and watch what happens). The auto-dimming was every bit as bad as before. To be honest I would be surprised if Samsung actually bothered to address this in any way, so I'm not convinced the latest update did anything.
This is just my observation.