I don't have any data or sources on this; if my memory is correct the participants were actually anonymous and the only reason we know Ted Kaczynski participated is because of his brother, so we don't even know who the other people were. However, I expect if another one had also become a terrorist, we would have heard about it. There were just a handful of participants (1 or 2 dozen or thereabouts), so it's not really enough for a "proper study" anyway.

Also: many people (myself included) were extensively and viciously bullied in their childhood and/or teen years. Many suffer profoundly negative effects from this, sometimes for decades or even their entire lives, but most are not terrorists. And even if it did turn out that the incidence of terrorists was higher: that still doesn't absolve them or their own responsibility in committing violent acts against random people (i.e. terrorism).