To be fair, the article is trash. There's details in other publications, like Reuters:

"Waymo said its vehicle was at a complete stop at a four-way intersection when a large truck crossed the intersection in its direction. At its turn to proceed, the Waymo car moved forward.

However, the cyclist, who was obscured by the truck which the cyclist was following, took a left turn into the Waymo vehicle's path. When the cyclist was fully visible, the Waymo's vehicle braked heavily, but wasn't able to avoid the collision, the company said."

Drafting through an intersection is not very safe (I really should stop doing it myself) because of this exact visibility problem. Heck, it seems our cyclist friend cut left because they couldn't see the waymo car either.

Watch out when crossing busy intersections, folk! Cars are bulky and opaque. Yield when encountering busy intersections.