As-is to an extent that avoids lying, yes,
but not to the extent that fixes an invariant section.
For example, if an original (by Dr. X) said
"Churchill was a pompous windbag that everybody hated.",
then I might write "Dr. X wrote "Churchill was a pompous windbag".",
which is fair use in the context of an encyclopaedia article,
and release that under the FDL. Then a derivative FDL encyclopaedia
should be able to shorten it to "Dr. X called Churchill "a pompous
but that wouldn't be possible if my FDL release classified the quotation
as an invariant section.
Sorry. Now I follow you.