“It has been dubbed Britain’s ‘most woke’ roundabout because drivers must give priority to pedestrians, then cyclists, and then other cars and lorries before continuing on themselves. Locals have pointed out the priority for cyclists and pedestrians is unnecessary as only cars and lorries regularly use the Boundary Way route.”
It’s the context switching. The cycle lane forms an effective roundabout around the roundabout. Drivers are keyed to looking for cars and cyclists on the road. The outer rim will push the cyclists out of their awareness. In effect, the bike will “appear” suddenly and at speed. Most drivers will still be fine, but a few will cause potential chaos.
Basically, it doesn’t follow the normal “flow” of most roundabouts. A few bad drivers will make everyone else’s life difficult.
And if that’s complicated you should not at all be allowed to have a drivers license.