I don't like blanket statements either. There have been successful emergency landings on highways, with no damage to life nor property. As well as horrible accidents too.
In this one, they experienced a serious power loss after a touch-and-go, and the instructor flew it UNDER the last bridge (was already in flare).
Since they had a bit of power, they "hovered"a little above the traffic and it gave sufficient warning signs to traffic. A police car also noticed the problem and drove up behind it.
(I just flew this very same aircraft, by the way. )