Isn't this in use already? Off the top of my head I can name 3 buildings on my school campus that kill your reception as soon as you get in the vicinity. This seems like it's just taking that and scaling it up.
Not that I like it, but it seems like Apple is a little late to the party here.
Did you watch the video? It's not a jammer, because that interferes with government's comm equipment. It's a way to remotely control your device.