I thought these attacks work on a much lower layer - by adding a repeater, which is essentially extending the range of your fob? I.e. they just pass the radio signals back and forth, without analysing their content at all. Can anyone confirm/deny?
https://www.cnn.com/2023/01/27/business/progressive-state-fa...
Down here in Australia it's been a legal requirement since 2001 that vehicles be sold fitted with immobilisers, and our versions of the Kia and Hyundai models mentioned in the article you link to are not vulnerable to this attack.
The engineering work is already done, it is pure greed on the part of the manufacturer to leave it out.