I was testing the armor for a while and indeed it does have a higher activation %... but not in an exaggerated way, it simply activates after doing some damage or giving a few hits.
I think that the function is to try to activate at the same time as the mythic weapon... before the update it didn't even activate... now it activates in a much more coherent way to the type of weapon with which it is used... since it is not trying to combine with the skull axe which gives multiple hits....must now be activated in conjunction with a weapon that can only be activated with single strikes.