Cr*p. The dude is using Cibachrome paper.
If you’ve seen it, you’ll know what I mean. That stuff is nearly magic, it is so good.
I have some cibacrome prints that are more than 30 years old. They look fantastic. Used to work in a commercial darkroom full time. Souped so many prints. It was bad in the winter, go to work in the dark, work in the dark, drive home in the dark.