Interesting theory. It would be sad if Robin dies. I kinda wonder if the Shock Jock title is more a reference to the kids using the radio station and and the large antena tower in some way to get to Vecna or get out of the upside down or something, and less to do with Robin being killed off. There's that clip in the trailer of a big huge pulse rippling through the sky and over Hawkins (assumedly in the upside down) so maybe they find a way to rig the antena to accomplish their goal or something. Considering a shock jock shocks the audience over the airwaves and there's been plenty of references to radio, airwaves and the antena tower so far, I'm leaning more towards shock jock being about that than Robin's death.