First off, I understand your frustration with this car right off the bat, but the rest of us have had fantastic performance from our 2020+ Sonatas. I'm at 170,000 with few issues (knock on wood). It's by far the best vehicle I have ever owned. I replaced one bad spark plug coil at 160,000 miles, and they're like $30.
That being said, you don't know if the previous owner jumped railroad tracks with yours. So is it Hyundai? Accident? I don't know how a car with only 30k miles already has a different set of poor-quality tires on it unless very bad things happened previously.
Interestingly enough, I just developed an oil leak in this exact same spot....after 170,000 miles. I'm not sure where it's coming from yet but for the rest of us this is probably going to be a future common area to keep an eye on. I will post in the forum when I find the leak location.
As for antifreeze, this particular model by design vents a tiny amount of antifreeze odor. This is not a coolant leak, as in active seepage from the coolant system. You'll very often smell it when exiting the vehicle. Not saying you don't have a leak, but you might not. After 40-60k miles you might notice a liquid bubbling sound when pulling from a dead stop. This means you need to top off the coolant system. This, from what I've read, happens to all owners of the 2020+ Sonata. For me, this means topping off the coolant annually. For others, far less often.
Good luck with your car. Considering my 2018 Camry was total garbage, I suggest you keep the Sonata once you get these issues solved. And, change your transmission fluid whatever car you keep.
My employee just bought a new Elantra. He loves it.