Hypothetically possible but the article suggests these were situations where Waymo was not at fault. And I actually know people that have been rear ended at traffic lights or junctions. Twice. In the same month. Both times after they came to a full stop in a spot where they were definitely required to stop.
There's nothing you can do when that happens. Some idiot coming in way too fast not paying attention for whatever reason. Stuff like this is quite common. I don't see how you could mitigate that easily.
I've mitigated it in the past. You sound your horn, which can cause them to look up from their phone, etc. You can also pull forward through the crosswalk if it's clear. If anything, Waymo sensors should be better able to identify vehicle speed delta to sound the horn when a vehicle is approaching it too quickly.
There's nothing you can do when that happens. Some idiot coming in way too fast not paying attention for whatever reason. Stuff like this is quite common. I don't see how you could mitigate that easily.