I think that’s a very safe assumption, yes.
Also, if anyone ever comes across a non-revised first draft, please let me know! I’ve never seen it. (The one I linked doesn’t say “revised,” but it’s identical to all the ones labeled “revised first draft” I’ve ever found and I just tried to link to the best-quality copy of each draft I could Google within ten minutes since I didn’t feel like figuring out which hard drive my PDF’s are on.)