2010 Hyundai Elantra Tire pressure

Different pressures don't hurt the tires. I take it to mean you don't want to bother correcting the pressures because you won't be driving the car. If you ARE going to be driving it, it only takes a couple of minutes to stop at the gas station and pump them up.

You should understand that all cars today are required to come with the tire pressure monitoring system, thanks to our elected idiots who need to stick their noses into everything, but the system doesn't actually have to work. In other words, there's nothing illegal about driving a car with a defect in the system or it's just not operational. It wasn't too long ago that cars didn't have these systems, so you wouldn't have the warning on the dash.

The bigger problem with incorrect tire pressures is accelerated tire wear and reduced handling and steering response.

Right, but you didn't say the car would still be just sitting. You have no reason to worry if that is the case.