Digital BW, The Print

http://www.wilhelm-research.com/phototechniques/PhotoTechniques_WIR_2005_01.pdf

"Archival" is a word we don't use anymore. Its original definition was
usually interpreted to mean "lasting longer than 100 years."

Also, his goal certainly is for consumers simply to believe his numbers:

"The choice is there, in very simple terms, using Wilhelm Research
Numbers." 

Either Wilhelm communicates the limitations of his "results" clearly,
noting conflicting results when they occur, and correcting companies
who sloppily use his numbers in advertising, or he doesn't. It's a
matter of credibility.

If he doesn't address the stability of paper itself, including
yellowing and physical decay, he doesn't even address what most people
mean by print permanence. I believe most are much more concerned with
yellowing and crumbling of old photos than they are with Dmax.