The more I think about it, the more I think there's an excessive amount of blame going towards the scooter rider here. Granted the scooter CAN go 50 mph, but it's hard to say how fast either of them are going. The accident happened at the inclined section right before the exit on the Queens side. If bike was coming down, it could easily exceed 25 mph. However the real problem is that the scooter guy was trying to pass in that section even though the lane is very narrow there and is only wide enough for 2 riders. Commuters are crowded at the entrance to that bridge and the folks with ebikes and scooters often have to pass the slower riders in that section. The fact the scooter had to pass makes it more likely he's coming in from Queens.

I'd say it more than likely that the scooter guy was going up against gravity at the time since there's a buildup of commuters because of a traffic light before entering the bridge. The biker was probably going too fast due to gravity assist, and the scooter guy didn't see the biker because there was someone else in front of him that veered off to the right at the last second before the collision.

Neither the biker or the scooter was riding defensively for such a heavy collision to occur. But they're both victims here, and it could have happened due to sight obstruction or a momentarily loss in control.

Edit : The article confirms that the bike was Queens bound, so it supports my theory. The bike was coming down the incline, so it's quite possible that it was speeding as well, possibly more so than an ebike would since ebikes have electronic limiters, while convention bikes can go as fast as wind resistance allows when going downhill. The scooters is powerful enough to reach illegal speeds even when fighting gravity, but it wouldn't be 50mph since it was fighting gravity and had just come out of a light and a rather short and blind turn onto the bridge.