The data in your links is inconclusive. It is improbable that the 25mph speed limit, in effect for only 2 months, accounts for the drop in fatalities from 2013-2014. There were lots of other Vision Zero things happening in 2014 that likely had a bigger effect. 2015 was the first full year with the speed limit, and it looks like no real impact from 2014.

2014 (2 months of 25mph) : 140 pedestrian fatalities

2015 139 pedestrian fatalities

2016: 148 pedestrian fatalities