There are also versions of that adapter which work for the other side of the technology fence: https://9to5mac.com/2021/09/20/carplay-to-wireless-carplay-adapter/

I'm unclear why such adapters are needed, or how they work. My car (Accord 2017) has wifi but, I am pretty sure I still need the USB cable to use Apple Car Play. Why doesn't it have that feature in its current existing WiFi? (Answering self: Because auto manufacturers are slow and they didn't add wireless CarPlay until 2021)