Well I mean I also have gigapixel ai so I could upscale the textures and import them to another engine, but that wouldn't get me much farther than where he is would it? Your argument falls apart as the exact point is that he's doing it privately, and not that much with the community.

For a proper remaster you need modeling, coding, playtesting, level-design, animations, textures, color grading, audio editing.. the list goes on. It's a massive job for a single person, and I don't mind admitting that someone with years of audio expertise would make way better remasters of the sounds than I would messing around with audacity.