The RPG-7 rounds uses a piezo-electric fuse, meaning it needs sufficient crush pressure to activate it but I'm pretty sure that what madmikechoi was referring to was the fuse of the alternate warhead in the video (in this particular case, it appears to be an 82mm mortar shell).
From the very little I understand of the video, they appear to be showing a homemade munition that was fired against them, to the camera crew (as opposed to them making it themselves). It consists of what appears to be the normal RPG-7 propellant/fin body with an adaptor to allow a mortar round to be mated to it (making some kind of direct fire mortar weapon out of the RPG launcher).
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