Yes, it does...I found this out because after I got the download prompt, I canceled out of it to relay the message to OS. That was D-U-M-B - the auto-updater wouldn't come up again, and so I had to delete my game data (1st patch and all) and redownload the patches. It only came up as 1 download, 29 MB I believe.
Word of advice - don't EVER cancel out of a patch download. You have been warned.