(Background: many pre-2023 or so Hyundai, Kia, and Genesis models have a catastrophic security flaw that allows thieves to open, start, and drive affected vehicles without needing any access to the key fob at all. This is far worse than a signal cloning or relay attack and has resulted in skyrocketing theft rates and spiralling insurance costs in many countries…)
Nothing to do with immobilizers: that was a separate issue that was apparently fixed in 2021.
It’s a wireless attack that affects late model cars with proximity-based keyfobs (ie: ones that do not require a button to be pressed on the fob for the car to detect it), including 2022 and 2023 models such as the Ioniq 5 EV:
