I feel like you are injecting facts with a lot of assumptions. How do we know a human driver would have taken longer? What if the human would have seen the bike 200 yards up the road 45 seconds ago, and since bikes don't disappear, waited a half second before proceeding into the intersection. Or what if a small portion of the bike was visible?
It could have been absolutely unavoidable but I don't think we know that now.
It could have been absolutely unavoidable but I don't think we know that now.