It would be a “lie” if it was presented as factually accurate. It isn’t; the title card clearly states
(not historically accurate)
What adding color, sound, stabilization etc. does do is help the viewer feel slightly more connection with what visiting Los Angeles during that time period might have felt like. Just like painted replicas of ancient Greek statues provides a more accurate impression of what it would have looked like to walk down the streets of Ancient Greece than the pristine white marble most of us are used to seeing even if we have only partial information hinting at how all the statues were painted.
