I'd be surprised if this were the case, especially since there are stems from a few tracks on the second album (Whole Lotta Love, Ramble On, What Is And What Should Never Be, etc) 'out there' online.
Page has brought up the idea of remixing the catalog in surround during a number of interviews over the years, but I guess he just hasn't gotten around to it yet. With the newfound industry push for Atmos, I think it has a better chance of happening today than in 2018 (the last time it was mentioned, to my knowledge).
https://ledzepnews.com/2018/02/18/jimmy-page-planning-led-zeppelins-fiftieth-anniversary-18-months/