Same principle yeah. Two vibrating forks. Emerson has some that cater to brewing and have built in ABV, Plato, and Brix calculations. One could probably come up with some cool uses for one in an automated system like this.
I believe what he is referring to are called ag liners (here at least). https://www.google.ca/search?q=ag+liner+panel&safe=off&espv=2&source=lnms&tbm=isch&sa=X&ved=0ahUKEwidk469i9rSAhUGw2MKHWY7BLcQ_AUIBigB&biw=1920&bih=990
You can insulate between existing studs, install your vapour barrier...