So Universal support staff might just be ignorant or incompetent (not unlikely if you remember the NLOTH leak fiasco)
The other thing could be that the album was digitally recorded after all, I'm not sure - it was recorded on tape but it could be digital tape. If so the rerelease would not technically be remastered but remixed or enhanced.
@u2 makes this point too:
That's the strangest thing to me right now -- the word "remastered" doesn't appear anywhere on any of the album promotional material or the online store listings. Is it because the album itself was already recorded digitally and there's nothing to remaster? I'm not sure, but I do see that the liner notes of my Achtung Baby CD booklet say:
"Digital Editing by Stewart Whitmore / A&M Mastering Studios"
That leads me to think the original recording is already digital, so there's nothing to remaster. Then again, I'm far from an expert on recording studios/techniques/quality/etc.
So perhaps there is still hope, is there any definitive way of knowing how AB was recorded?