Yes, and the remark at the post's bottom, "Structured editing wasn't actually a bad idea, it was just poorly executed." seems oblivious to Boxer -- I found it usable enough (and inspiring).

diSessa's book http://www.amazon.com/Changing-Minds-Computers-Learning-Lite... has more on the philosophy and the experience with kids using it. The writing style's a bit of a slog.