I don't think toe clips or clipless pedals are to blame for the drop. His left foot came off the pedal just fine, but he planted his foot too far forward. I think it was a lazy stop and he just didn't do it right. Perhaps the gravel threw him off a bit as well.
I've seen a trend toward fatter tires on comfort bikes, especially if they are electrified. Big fat heavy tires are inefficient, but who cares if you have a motor to help push you along.