Sorry, but that makes no sense. The only reason I'm using any computer at all is to solve problems. Even if that problem is "entertain me", if my computer wastes my time in any way, I'm not going to look at it and say "Oh, gee, that frozen loading bar is just so much ART that I don't mind waiting on this shit box to do what I say."
A painting which wastes your time is not a beautiful painting, regardless of your perspective on subjectivity.
I don't think he was calling the user experience art so much as the solution. It's true, there are many ways to solve the same problem and many can be effective warts and all. There is some artistry to it, at least today (maybe someday we'll solve this problem).
A painting which wastes your time is not a beautiful painting, regardless of your perspective on subjectivity.