Watch the video more closely. It was a blind curve. They didn’t see the road block in time stop. That was very clear from the video. Pay attention.
In other words, that road block ambush was there waiting in a blind sweeping curve. They had no time to stop and why he avoided the road block by swerving off the road into the snow.
His brake lights were on as soon he got to the curve. So it would be reasonable to say it’s possible he was attempting to stop. Or maybe he was just slowing down trying to look for a way around the roadblock. We can’t tell conclusively from the video.
Regardless, I don’t think it would be a blind curve at legal speed.
So he was speeding away from a police car, crossing a double line repeatedly and was unable to stop (or refused to stop) for a roadblock and either hit or almost hit an LEO. Whose fault is that?