They’ve implemented a prototype, but it hasn’t been brought to market yet, so we’re probably not talking about the same thing if I had to guess. I’d recommend looking into the cybertruck implementation of it if you’re curious, I do think it’s ahead of its time and will remain novel for a while. Also engineering explained did video on the Lexus prototype. It suffered some pretty severe input delay, I have my curiosity if the Cybertruck implementation has the same issues but I’ve not seen anyone mention them yet.
Your question is worded very oddly, but to attempt to answer it, headphones (most) operate off of an analog signal from a DAC (digital to analog converter). In any analog setup you’re going to have some amount of signal transmission or line noise unless the two transmission lines are entirely shielded or entirely separated.