Interestingly named package given that it's clearly using quite a few non-ascii characters which will break non-unicode aware consoles. Also that the description, Node page, and github repo list different licences.
"ascii" these days is so often used as a synonym for "text only" that I suspect a fair share of the people using it as a word does not know what it stands for or what it originally meant.
Everything in there looks ascii to me, just using the charting characters in the high end of the table.