You'd have to contact Denver Outfitters to find out for sure, but outside of the Bundutec, Autohome Maggiolina , and James Baroud style of brand name tents (there are others as well) ... it's highly likely that most roof top tents available today are a re-badged Chinese tent.
Nothing particularly wrong with that (I own a CVT, made in China, holding up reasonably well), but probably worth spending a bit of time thinking about your long term aims as they relate to reliability and weatherproofing.
When I purchase another roof top tent, and knowing what I know now as a CVT owner, I'd likely only purchase a South African or Australian brand, made by hand in those countries, and made by tent companies with a clear and solid track record.
As the owner of a CVT (which I do enjoy using), I now realize that there are very important quality and workmanship differences between the Chinese tents and those tents made in countries where Overlanding is taken far more seriously. Those differences have a profound effect on the long term viability of your rooftop tent purchase.