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Why do many full face bicycle helmets not conform to the ASTM F1952 standard?

It seems to me that a lot of full face bicycle helmets do not conform to the requirements of the ASTM F1952 standard for downhill bicycle helmets. Some noteable examples from the best selling list of ...
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Difference between Mavic Deemax Ultimate 2011 and latest version

Have an offer to get Mavic Deemax Ultimates from 2011 for my downhill bike. They cost half as much as the current model. Can anyone tell me what the changes are compared to the current models?