No, I’m challenging your claim that new advanced cycle boxes are the reason the islands are being removed. I have never seen anything that suggests that, and it doesn’t make sense given the advanced boxes are set back behind the pedestrian crossings.
Advanced cycle boxes on all 4 arms instead of just 2 is a good thing. The new wider pavements are looking great too, 3 of the 4 corners are finished now. So much better for the heavy footfall. Pedestrian countdown timers have been needed for a long time, it’s positive that they’ll be added also.