At least in my perspective, it appears as if the cyclist never contemplated that a driver could move across. I’m not saying the driver should have moved across, they shouldn’t have but you still need to have an awareness of other road users and not ride around nonchalantly on a large major...
Arguably lazy driving but it’s one that has been missed right in the blind spot. I used to jog through this roundabout every morning on the way to work, there’s a bike path for a reason - use it.