This feels like a common KIA dealership thing, which is a shame, because they are finally making somewhat interesting cars now.
Around the time Kia Stinger GT came out and the hypetrain was pumping at the max (2017-2018), I heard plenty of stories of people being refused Stinger test drives at the dealerships. Most of them had a common theme of the potential buter not "looking right". I.e., too young or not looking like what the dealership employees imagine someone who could afford Kia Stinger would look. Often it was outright refusal, other times it was some bs made up reason, even though it was obvious the cars were used for test drives and were available. Conveniently enough for the dealership, just not for those specific customers.
This is extremely ironic, because the more "premium" the car brand is, the better they treat you at the dealership, even if you clearly cannot afford it at the moment. Here is a personal anecdote.
I went to a BMW dealership once (the most "premium" brand dealership I've ever went to by that point in time), because I was thinking of upgrading my decade+ old Camry. I didn't have money at the time to buy, but that was fine, because I had honestly no idea what car I wanted in any terms other than i wanted it to be "good" and "no larger than a Camry, preferably closer to being Honda Civic-sized". So I scheduled a bunch of test drives at different dealerships to try out a bunch of different cars and see it for myself. Plus, even if I had the money to buy at that time, I knew that a major redesign was coming for BMWs I was looking for in the next few years, and I was going to wait until then regardless. I didn't want to waste anyone's time, so I honestly told all of that to the salesman working with me at the dealership. The experience I got was great, even with all of that info in mind. No aggresive sales tactics, no "we might have a financing option that could work for you" insistence after being told "no" once, suggesting other fun cars to try ("since you aren't planning to buy now anyway, wanna try this cool i8? I know a street about a mile away that is a long stretch with no cameras or cops, and it is usually empty, so we can test out the car there for real."), and in general just providing great service all around (any inventory questions and delivery times were discussed in the most plain and no bs terms). I don't even like BMW cars, but this experience made me strongly consider one in the future and understand why some people swear by brands like Mercedes/Audi/BMW/Porsche/etc., despite some of their cars being pretty questionable and (arguably) not the best bang for the buck.
Disclaimer: I've never owned and still don't own a car from any of the brands mentioned, and neither do I have any relationship with those companies outside of test driving a few of their cars.