I have not seen this Steam Way tool so I find the drawings a little confusing. I have talked with Dave Nalley, Owner of Steam Way Internaional, about the Fast n Dry. He uses it in his cleaning business in Wyoming. I believe it is his own design, so the tool is not real old, definitely not a fossil. He claims it is good for agitation while cleaning. I don't think he will sell it to just anyone. He likes to package it with his Steam Way system he sells, likely his revamped Powermatic 2200. They were expensive to build so he makes very little selling them.
I personally think it must be an excellent upholstery tool that should last and clean well and leave very fabrics very dry. If I did much upholstery I would consider getting one, but I still have several tools including my go to Hydrokinetic along with the Rotovac Sheardry, pmf internal jet, Hydro and conventional tools. Also, don't know how long I will be cleaning.