I don't say what I really would like to say. Instead, I repeat this:
Relocating the Users folder as told in this tutorial never fails when done correctly. It is a native feature of Windows, the ability to relocate the Users folder is built in. When it fails it is always, without an exception, an error either in the answer file, in the install media used, in the selected CPI source WIM file, in wrongly assigned drive letters and so on.
Just to prove my case I just installed Windows 10 Pro on a Hyper-V virtual machine, entered Audit Mode, manually changed the drive letters, started the screen recording and run Sysprep, capturing the whole process in video. First take, first try, everything worked.
The video is encoding now, I will post it on YouTube shortly (within a few hours) and further post it here. Sorry, can't do it faster; encoding it takes some time, as well as adding information texts:
Notice that you don't have to take my word about it being first take, first try; during the past months we've had a few Ten Forums Live Chats, streamed live here at the Ten Forums, for our members to meet each other and chat, with a possibility to present from our desktops (see here what I'm talking about). I am fully prepared to show this process live when we have the next TF Live Chat, I will post the link to the chat and to the live stream here and you see this process when it's done correctly, follow it live as it happens.