Huh. I wonder if this was an early model thing. My 2020 Rad has a throttle disconnect on both brakes and the rad parts and instructions for those parts include the brake sensor. The brake handle sensor on mine also operates a brake light. On the mechanical disc brake rad that I have they even go so far as to disable the brake lever adjustment by putting a warning sticker over it to ensure that you don’t adjust it out of range of the limit switch.
https://support.radpowerbikes.com/hc/en-us/articles/44061799...