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I don't think it relates to ASTM at all. MIPS is an independent standard designed for impacts at an angle, allowing the inner shell to rotate so as to attenuate the impact and concussion risk. AFAIK the standard tests for helmets (ASTM, CSA...) are direct hits that test the structural integrity of the helmet.
If anyone is looking to buy a helmet, Level Nine Sports has a huge "Thursday Only" Sale Today (October 23rd). Bern 2015 G2 Zip Mold Helmet is $49.00 MSRP is $139.99
Thanks for the link. Picked one up for my son for Christmas. Great Price!