I think it applies to many manufacturer vehicles that had a connect service, like BMW that are typically 2015 and older. Many didn't put 4g and definitely not 5g into their basic connected services for cost savings. Tesla's, some year's previous, I believe 2015 or older (don't quote me, there is a thread somewhere with the specifics) are affected.
I think most cars after 2015 are fine, 4G isn't going anywhere, they can't even get 5G rolled out and working reliably and widespread although the phones often support it.