I thought the article said that OH treats black powder as a firearm?
Here in the People's Republic of New Jersey, a black powder gun is considered a firearm. A seller couldn't/ wouldn't sell me a black powder firearm by internet or online and ship it to me directly if I tried. If I wanted to buy one, it would either need to be shipped to a New Jersey FFL, or I'd need to drive across the bridge to Pennsylvania to legally purchase one. (Most people here do the latter, I think.)