I was kind of "yeah, looks ok I guess" about this until I saw a screenshot comparison of a guy who was clearly wearing a pinstripe suit in the original but in the "enhanced" version just looks like he has a weird moire effect on his arms.
Looks okay, but there's some definitely some lost details on clothing, skin, etc.
It's interesting to compare this to the C&C Remaster where they used a similar technique on the FMVs. There, the FMVs originally had more detail than the downrezzed versions that got shipped with the game, and the training set probably contained a lot of video very similar to the FMVs as well. So the reconstructed 4k version looks mostly ok, because the original version of thing that being reconstructed originally contained information similar to the information that the machine learning algorithm is smuggling in via its training set.
With the BR remaster, what went into the final cutscenes is probably pretty close to all the information that existed in the models and textures to begin with, and the assets used were all bespoke so you can't really have a training set that matches it. So there's no information to smuggle in, really.
Plus, the original game was heavily marketed on the voxel rendering, so I feel comfortable saying that the "pixellated" look was a deliberate part of the aesthetic. Smoothing everything out to make the game look like that
ReBoot animated series was never the intention. (Again, this isn't true of the C&C Remaster, where the pixellatedness of the FMV in the original was almost certainly just a technical limitation.)
So, I dunno. I think I'll just stick with the GoG version unless the remaster lets you swap to the original graphics
and it adds some useful QoL (like removing the
one scene in the
entire game where you actually have to use your lousy gun, the mechanics for which really sucked).