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Not at all. The decline, welcome as it it, is down to a combination of factors and can't solely be attributed to rising cyclist numbers at this time. If that were true then we wouldn't see the statistics reported in this table here: https://en.wikipedia.org/wiki/Cycling_in_London#Statistics
There's continual growth in cycling numbers between 1999 and 2014 but there are three observable spikes in KSIs. I'm hoping that you aren't going to call those counter-flukes because that really isn't the case. What we can't determine is that the increase in numbers didn't not provide additional safety for cyclists.
So the fact that absolute numbers of KSIs and fatalities have dropped year on year, while number of trips by cycle increased is a fluke?