I was confused also when I first saw. Perhaps someone need to notify the EternityProject thread about the version number so it does not cause more confusion.
I still can't post to that thead , so maybe someone else could do it.
BTW, After the update, running Motorola Software Update does not update anymore, since we are already at the latest version.
I guess using Motorola Software Update is the safest way to upgrade and for sure it should not void your warranty.