Why do you think that? Here's a quote from the Acoustic Sounds website (the manufacturer)...All 6 albums on SACD disc - but only 4 in SACD Multichannel Surround Sound.
"All of The Doors' legendary albums — The untoppable self-titled 1967 debut The Doors, one of rock's most important debuts, Strange Days, Waiting For The Sun, The Soft Parade, Morrison Hotel, and the visceral L.A. Woman — have been remastered by Doug Sax and The Doors' original engineer Bruce Botnick, and made available on Multichannel Hybrid SACD for the first time in the U.S.!"