Yeah, that's incorrect. Good eye.
Funny how an error casts a suspicious light on the remaining information in the chart.
Still, that site is chock full of good tidbits, and I really like their blade mounting video.
I like the boot vices and holders that they sell too. I might pick one up if I stay with hand-sharpening. I've intended to make something like that using wood for the "last" and off-the-shelf hardware items, but I'm sure that it would cost as much to make as to buy.