??? Cars have had turn signals since at least the early 1950s.
Pretty sure he meant there was a warning chime that would come on if the turn signal was left on a while. Not the "click click" noise, but a warning chime.
It seems like auto cancel didn't always work so well, and most cars since the 80s probably don't have such a warning feature. Most of the time when I've seen a car just cruising with the signal on, it's something with an old 80s/early 90s or before GM steering column. I remember seeing Grand Wagoneers doing it. Now if a modern car has the signal on for way too long, it's probably someone trying to get over who thinks their car is the size of an 18 wheeler and has no idea how to merge or change lanes.