No, but I can see where one might think that. Phil Spector who produced Unchained did layers of music in rich orchestrations with lots of reverb. "Nights in White Satin" came off of the "Days of Future Passed" album by the Moody Blues, which was intended to be little more than a demo of a new recording technique by their label. I guess they didn't care that the Moody Blues, who had just replaced two band members, were doing it. The idea was to get a blend of rock music with the music of an orchestra to show off the technique. Of course, the album ended up being a big hit for the Moody Blues and nobody cared about the recording technique. The words and melody for "Nights in White Satin" was done by Justin Hayward of the Moody Blues, one of the new members at the time. The orchestra part was done by the London Philharmonic. I believe their conductor wrote the extra music. If you want to know who did the poem you'll have to look it up on the internet.
BTW, if you like that kind of sound give Enya a try if you haven't already.