You are correct, it did not stick, but by US law Bourbon does have to be made in the US. Associating alcohols to a region has always been a tedious argument, but distilled alcohol is especially silly. For things like Champagne they can claim things like the soil of the area impacts the flavor (Vidalia onions), the culture of specific grapes in the region are important (this isolated variety of grapes are only cultivated here), or maybe something in the air contributes to the process (Belgian sours), but Bourbon just requires it be made with at least 51% corn and stored in a charred oak barrel.

Bourbon may have originated from Kentucky there is nothing about Kentucky or the US that impacts the process. I can make IPAs without being in the UK and I can make Berliner Weisse without going to Germany, I see no difference with Bourbon.