Yes. It should be the FCC enforcing their regulatory duties against specific car models not the house legislating in general. The amount of interference on the low frequency bands that some electrical cars produce prevents reception of AM. And that was already very illegal. You can't do that but car manufacturers were/are too big to care. The public safety aspect of it is entirely secondary.
The way the ruling was made, it will be a case by case basis. If a republican FCC does it, that will be fine and normal but if a democrat does it, it's out of the legislative authority.
Either way, the 5th circuit will stop the rules from going into effect.
They're referring to the recent decision which reversed the Chevron doctrine, which allowed courts to defer to the interpretation of ambiguous regulations by regulatory agencies. The most common interpretation of this decision is that it has the effect of nullifying the ability of regulatory agencies to regulate, and removes the bulk of their former role to Congress.
Here is a lengthy HN thread about it: https://news.ycombinator.com/item?id=40820949
Didn't the Supreme Court basically say recently that the FCC and similar Executive Branch groups can't enforce such rules? They must come from the Legislature to have any hope of surviving review.