I guess threads like this remind me why it's nice to have professional doc writers review my customer-facing text at work. ;) Congrats on your project getting some more attention! If you'll indulge a bit of bikeshedding, this particular miscommunication could probably be avoided in the future by changing the sentence to the short "The PDF rendition of the reference manual is over 600 pages long." Even if you add extra things to the PDF later the statement won't be incorrect and so you won't have to deal with nitpickers coming by next time with a comment like "But if you remove the index it's only 597 pages!"

Another edit preserving more of the original would be to replace the final "with no" with something like "even excluding any"...