The documents rebut the last of those who would deny the Holocaust, Bild said in its report.
Actually, a liberal of the era would have seen Gaskammer and automatically decided it meant de-lousing room.
Depends on the size. If you have a 10x10 ft room with wooden racks all along the walls, then yes, it's a delousing room. But to exterminate so many human beings in a few short years, you'll need something bigger. Not to mention the problem of manipulating the corpses after that (cannot really touch them if they are oozing cyanide gas...) -- all of that requires a lot of infrastructure, and I don't think it would be mistaken if it was on blueprints.
That said, there is a distinct possibility that the blueprints are fake. Just like venomous spiders, the Nazi regime continues to exert a sort of fascination, including among Jews. There is a very active market for fake Nazi paraphernalia. And we all remember the latest Hitler diaries which turned out to be gross forgeries.
A Jewish friend who works in publishing once told me that a Nazi story with a swastika on the cover will always outsell a similar story without these references. Pretty sad.