You can't update netflix (and probably hulu) from NUSGrabber and WUP Installer, because the new versions are not in form of updates but as new full release.
There's no Update available (0005000
E10105A00)
Only the full title is available (0005000
010105A00) but WUP installer can't install this.
The only method to update netflix is to delete it and redownload it from eshop. (I don't know why I had to delete it, probably because it's not an update and eshop saw I always had a full version so it didn't want to replace it).
To access eshop with spoof, you need to run HBL, then NNU patcher. (there's a version of NNU patcher for HBL).
A way to bypass the update is to block Tagaya server, so the console can't see if there's a new update available and won't tell you that you need to update
It works great, I can launch games or apps without updating them.
BUT you need to block Tagaya server BEFORE there is a new update, or the console will already have that information stored somewhere on the console.
So, blocking tagaya is only useful for future updates, not past ones.
I disabled tagaya when I updated my xenoblade, so I had to update netflix because the console was aware of the new version. but it was way after people said a new update was mandatory.
I don't know which version of netflix I have, but I haven't updated since december, and I could launch it a minute ago without any update message.