...from my somewhat limited but recent experience (I've transited into/out of Europe via Rotterdam or The Hook in a good number of the last few years), speed isn't the major problem on the Netherlands roads; congestion is.
The article does allude to it, but for a couple of hours or more around the morning and afternoon rush hours, the whole central portion of the motorway network becomes a huge, virtually-unmoving car park.
I know commuting creates problems everywhere, but the regular traffic jams exceed anything in my experience elsewhere (and believe me, the German Autobahn can be bad), and are a product of nothing extraordinary (roadworks, accident, etc.) over and above sheer volume of traffic.
You're lucky if you move once every ten minutes or so, let alone do 100km/h.
Outside these conditions and locations, I doubt the reduced limit will improve emissions data by very much at all (though frankly, such a reduction wouldn't overly-concern me).
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Dutch to slash speed limit to reduce emm.. new
Dutch to slash speed limit to reduce em.. new