Right. What I meant was, they apparent created a new (4K) scan for The Abyss, degrained it, and then added 'fake' grain for the new master. It was a somewhat similar process for Aliens a decade ago.
My disc came in from Amazon (Prime) on Wed and I watched the Extended Version last night. I thought the disc looked quite good. At times in some scenes the grain reduction felt a bit too much, but for the most part it never crossed a really bad line. There seems to be some grain in most of it...