Completely honest! All cars are at least 4.5m, especially in the city where hatchbacks like the golf (4.2m) reign supreme. And what driver doesn’t love driving in bumper to bumper traffic, named for the more than two full car lengths between them and both the car in front and behind.
Not to say that the point they are dishonestly trying to make is invalid, but this is definitely playing with assumed numbers to exaggerate the point.
That’s a regional thing - I was very confused when I lived in QLD and that’s how people were driving. In Victoria everyone indicates the final direction before they enter the intersection (eg indicate right before entering if you’re taking 3rd exit, indicate left if you’re taking first exit).