It would be better not to publicize this for the murderous crazies who mutilate their victims to impede identification.
It’s on pretty much every other episode of every crime show out there... so it’s not exactly an unknown fact, and yes, there are criminals who do or don’t do stuff based on what they see on CSI. For example, knives are gaining popularity as murder weapons cause you can only rarely tie a stab wound to a specific knife like you can match a bullet to a specific gun.
I’m guessing that he just was dumb enough to think she was naturally that top-heavy.