I think it’s very easy to be wise from a distance with plenty of time to think about the video.
The cyclist himself commented on the discussion on the video:
The white lines are 4m long with a 2m gap. He pulls out when I’m about 12m away and doing 20mph+.
I was braking and, to avoid hitting the back of him because he didn’t accelerate, had to? go down the blind side because there were oncoming cars on the offside.
Seems fair enough to me. It’s a lot of speed to scrub in not a lot of time, on road brakes, perhaps not in the best body position to stop immediately.