The way they market, my guess is that they distill their own whiskey? Note that there are distillers that distill some whiskey, but then round out the supply with MGPI whiskey, which would allow them to talk about locally sourcing corn and barley while still relying on someone else's product.
That said, I don't know them well, and maybe they're like Few Spirits, a local distillery in Chicago that got started selling vodka and gin and gradually expanded into doing a whiskey. Few is not bad. I like Few. But I don't think a lot of people drink Few and tell themselves, "I'm drinking this because it is categorically better than Buffalo Trace".