I said the voice resonance modification is real because I am in progress of speaking with a voice surgeon about it myself.
quote:
"The thyrohyoid elevation works on the shortness and this procedure if we went ahead would be to likely remove a strip of tissue from either side of the throat to effectively plicate and narrow the circular dimension."
It is pretty known that the major resonance chamber in the body is the pharynx, the rest don't do much as resonance chambers.
I also doubt that we need to work on more than the throat considering some amazing voices people can do even if they have very deep voices.