I honestly do not know how IQ and the ability to judge the future outcomes of ones actions tie together.
I do know that confessing to crimes, and then saying that he’ll try to commit those same offences upon release is not a very sensible idea if he values his freedom from prison. On the otherhand perhaps the guy thinks his being a martyr for the cause and his openness will encourage others, time will tell.
That’s some pretty thick wood at a good angle. Maybe there’s a mythbusters, but I’d expect it could protect against small arms fire of the day.