In the 90s I had electronic shop. We did car radio installations. it wasn't that big deal to remove interference from AM radios and CB radios good. Because we needed a good old-fashioned choke on the power line.
Pretty sure all the high tech we have today we can figure a way to have AM radios work in electric cars. The first line of this article is incorrect but the rest of it is pretty good.
I have zero interest in owning an electric car.
I've bought four new Jaguars over my car buying life, still own two of them, but I won't buy an electric car.
Same goes with Ford and GM. They can mark me off the prospective customer list.
An electric car with a 50 hp motor is basically a 50 KW RFI source. The drive electronics operate at 50 or 100 KHz, so harmonics and junk in the AM band are pretty much inevitable. The motor can be shielded and the drive electronics can be "tailored" to reduce RFI, but many car builders are asking "why?" AM is not a big market any more, especially for young people. There are reasons to keep AM, like emergency warnings, but the engineering effort and cost are not trivial.
Lots of discussion about this recently on the Antique Radio Forum.