Low frequency hum when accelerating? Is this normal?

Oh yeah, totally abnormal but not a noise I've heard reported before.
Smart move providing a recording up front while you have our attention!

 

Really sounds like a driveline problem. Since it gets noticeably louder with applied power and pitch increases with speed, I'm guessing it's a duff bearing in the gearbox. First thing I'd do (if the warranty claim wasn't an option) would be to check the gearbox oil for sludge or glitter. Anyway, if it's under warranty it's the dealer's problem to solve. Sucks it happened in a new car but at least it happened early I guess?

 

it definitely sounds like a problem.
Since you’ve only had it a few days I think you can reject the car rather than having it fixed as it sounds like a major drivetrain problem. Or maybe use that option as leverage if they try to fob you off?

Keep us posted on what they say.
Good luck on the outcome.

 

Just my interpretation, but if the problem is in the motor, that would be covered under the "Hybrid, Plug-in Hybrid, and Electric Vehicle System" portion which covers "Traction motor, including housing case"

Anything else in the driveline would be under the Powertrain portion; Case and all internal parts (read: gears, bearings), axles, CV joints, hub bearings. This would include the gears and bearings between the motor output shaft and the splines where the axles connect.

In either case, you have at least 5 years/60K miles allowance which you are definitely inside of. I would avoid driving it until the problem is identified - god forbid you have a chipped gear tooth and it decides to grenade itself on the highway or something.

 

This is a known issue.

Hyundai and KIA notoriously avoid the necessary motor and gear reduction unit replacement.

*In my experience* it will be a full year before repairs begin and another 6 months before they authorize the fix.

If you can return this vehicle, now is the time.

https://static.nhtsa.gov/odi/tsbs/2022/MC-10211676-0001.pdf

 

Take a deep breath, get the dealer to acknowledge the problem in writing, you have a video of the noise which learned members say is great, so once it is acknowledged just monitor and log the history. I can't see it exploding, what we need to do is identify if the problem is random, or a inherent problem.
The more calm data collection and correlation of history, will mean a better outcome for everyone.
I have a Kona EV that I'm hoping to pass on to my disabled daughter, so I really would like to see us as a community sort this out.
Mine has done nearly 10,000km and I love it, but it hasn't got a noise, so to maintain its residual value we need to correct the issue.
That is my two cents worth.