Just because something is physically on the sidewalk doesn't mean it is a "sidewalk user".

If you ask me that thing is an autonomous motor vehicle, and as such belongs on the road and its use of the sidewalk is illegal. Just like it would be if its larger Waymo cousin tried to drive there.

Besides, that robot is also blocking and refusing to go out of the way of the human. There are no laws regulating who has to yield on a sidewalk, so good luck figuring our which one is in the wrong.