The Terminator 2 UHD DNR fiasco was due to Lionsgate using the 3D master for the UHD, which was DNR’d for the 3D conversion. I don’t think The Abyss would have that problem. Though I wonder how the color would end up looking, considering how Aliens looks on blu-ray.
LG used nothing. Studio Canal did the encoding. All LG did was release it.