The problem with the information you provided on that link...
We are talking about the 2D Blu-ray disc, not the 3D restoration.
We already know that there was work done to restore the 2D into 3D.
The question is, for those concerned buying the new 75th Anniversary
2D Blu-ray disc, is it the same transfer as the 70th Anniversary? Are
consumers buying the same disc twice?
Now, the article you provided does state the following...
In the meantime, the View-D team worked closely with Price at Warner Brothers, who provided a 2K version of the studio’s recent restoration of the film - See more at: http://www.studiodai...h.oLfDlxD2.dpuf
What does "recent" mean? That may very well mean they took the 2008 transfer
and used that as the master for the 3D conversion.
This is a real concern here for many, given the fact that when the Oz press release
was issued, the studio made no attempt to put a NEWLY MASTERED label on the
2D Blu-ray release.