That's not what "by wire" means though. My understanding is the steering wheel and brakes are mechanically attached to the steering and braking mechanisms.

"by wire" means non-physical ways in automotive. So accelerator and possibly brake pedals have only cable connections which carry data.

Even if the brake pedal is connected via an actual wire, emergency brake actuators can work by themselves on the system.

Electric assist motors on the steering column can also overpower a human with ease.

So, actual connections doesn't matter.