You may have to wait for an update. I think they switched some to 433mhz sensors in 2017. Most of the older ones had 315mhz.

Was the vehicle in relearn mode or were you just trying to read the sensors? I would have assumed it would have triggered the sensor even if it couldn't read it. The frequency to trigger the sensors should be the same so the car should have seen the sensor even if the tool didn't, I would think anyway.

You can possibly try and look up an older Chevrolet Malibu, I think some of those had 433mhz sensors. See if you can find one with a listing for 433mhz and try that. Don't know if it will work but its worth a shot.