PTW death rate is down 10% according to the BBC's chart, surely if there were many more of them you'd expect an increase, or certainly not such a decrease.
And why do they have ahigher ped ksi rate? I wasn't aware of this. I can only imagine it's mainly due to lane-splitting, which there would actually be less of where they are allowed in bus lanes (as, for instance, they have been in Bristol for twenty years or more).