I saw that site some months back and used it on some high school kids in Scottsdale..... very cool exercise. Once the tortilla's are toasted ( components removed first ) it worked just fine. The kids loved it!
This guy's missed a great patent opportunity, IMO. I wonder if you could squirt salsa on the backside to build up conductive traces.
Speaking of matza, you've probably heard about the blind man who walks into a kosher market after mistaking it for the braille bookstore next door. After rifling through a matza pile on the counter, he mutters in disgust, "Who writes this stuff?"