Here's a quick reference for torrefied wood used in guitar building....
https://www.pre-warguitars.com/torrefied-wood
I personally haven't played a guitar with torrefied wood but have played vintage acoustics and there is a big difference in the tone of an old vs. new Martin.
Maybe for pool cues it makes a stiffer and lighter shaft, or just a way to make your wallet a bit lighter. It sure adds cost to a "new" guitar.