This article gets history approximately wrong. Yes, Cyc failed at its original goals, but it's still going, kind of, and as far as I know was never intended for image recognition. Fuzzy logic isn't used much in science because probability and statistics are the more usual ways to handle uncertainty.
Given its inaccuracy so far, I'm not sure the article is worth finishing?
I remember reading about fuzzy logic in a discrete math book. It was exactly the same as basic probability theory. I think the article is overblowing it a little...
> Cyc still proved incapable of more demanding tasks, like digital image recognition, or more complex gameplay, like chess or Go.
As Cyc wasn't designed to recognize objects in images, or play chess or go, it's hardly surprising that it proved incapable of those tasks.