Looks like it doesn't do ballpoint, so it probably can't duplicate the varied indentations into the paper that a ballpoint pen will make. I've been checking mail from my Congresscritters to see which ones are using autopens [0] or similar technology, such as the link you provided. (NB the Wikipedia article for the autopen [0] mentions a model that functions on the x and y axes, but makes no mention of a z axis)
[0] https://en.wikipedia.org/wiki/Autopen