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Having read through that site- I take it in the same vein as the opinions of this thread (and again- how people should take my own)- examine the data and form your conclusion.
Outdated (last update was 2012) and substantially biased.
I don't get it, we still use pythagoras theorem and he hasn't updated it in ages. I'd understand the sections on statistics may need to be current for greater relevance reflecting cultural changes surrounding use but sections on helmet design unless a substantial change has been made to helmet design won't need to be changed or revisited.
You said the helmets were split. That means they failed.