The ALTIOS' hybrid suspension system, composed of a mesh panel and expanded polystyrene liner, makes this helmet extremely lightweight and comfortable to wear. Thanks to this innovative design, the helmet "levitates" above the head for a near-weightless feeling. The space between the head and the liner allows for effective ventilation with the Climate Control System
So I just got off the phone with Andrew @ Petzl headquarters in UT. He said the impact is mostly absorbed by the suspension, but it has the foam, too. The plastic casing and foam will crack under heavy impact.
I think you're missing the whole point. So the Meteor III (not this helmet this thread is about) does have the foam flush against your head. It has good ventilation, but it is still way hotter than the ecrin roc or the $5 home depot helmet.
But the Altios (the one this thread is about) has foam, but it ALSO has a suspension system. So you get the advantage of a super lightweight helmet that has ventilation holes, but also has a suspension system to keep the foam off your head.