In any case it seems that DAS proved to be very unreliable system (not that this wasn't mentioned long before this has happened) because no matter what type of the homing head was in question, it should be able to detect the missile plume, or the skin heat from the friction.
This is how such system are suppose to work:
At 0:27 we can see the perfect ambush, and multiple IR missile launches from extremely short distance and almost in eye level (missile doesn't need to travel for a long distance and gain altitude).
Helicopters that had MAWS/DIRCM combo reacted automatically and instantly, forcing the missiles to miss.
Nothing of that has happened in the F-35 video.