You are deliberately missing the point. The EU would have continued to conveniently ignore VW diesel emissions had the US, a competing power, not pointed them out.
> Instead the EU levied their own fines against VW including a €875 million fine in 2021.
Only because the US found them out. The EU was quite happy with VW until then, and liked to act all smugly superior about emissions.
> When can we expect the US to slap X with a multi-million dollar fine?
For what exactly? What US laws have X, under Musk, broken?