We still regard MIPS as unproven technology unless you have a helmet that couples so closely to your head that you can't move it even a quarter inch under pressure. It also sells new helmets and adds as much as 50% to the price tag.
They did not attempt to test low-level impact performance.
Here is the report on CPSC standard testing for their DBX 3.0 Enduro with removable chinbar. Impact liners are evolving, including Smith's models with collapsible plastic modules looking like hollow straws, POC's honeycomb material, Kali's carbon nanotube material and Conehead designs with dual density impact foam in helmet liners.
Leatt and Kali are using Armourgel hourglass disks in their liners and claiming reductions in impact forces beyond standard EPS, including rotational forces.
Virginia Tech's Biomechanical Engineering department has developed a methodology for testing helmets for their ability to reduce concussions.
After football and hockey helmets, they launched ratings for bicycle helmets in June of 2018.