That would be one hell of a way to misunderstand it! Riding with only a back brake isn't great, but plenty of people in bustling Amsterdam ride with only a weak rear coaster brake without mass carnage. I think the rider's attitude had much more to do with it than the bike.
If you are going to pass so close to someone that you couldn't miss them if they stepped out, you're going too close or too fast, so pass wider or slow down. Ride so you can stop within what you can see to be clear, not what you merely can't see to be obstructed yet.
The bikes they ride in Amsterdam a Bimble Machines not Speed Weapons.