It's an off-road switch that's illegal. Potential to Reprograme in isnt.technically there all illegal even 250w as you can change the settings for speed and power levels.
id not worry about it tho
I stay legal as I worry. A broken arm and wrist due to a 4*4 on the pavement , and the drivers friend tried to test my bikes brakes. She was done by the police. My lawyers are still working on the compensation.
Just because you haven't had problems doesn't mean it can't happen.
He's new. Give him unbiased advice and I wouldn't have said this but come in all. It's ok to use a 50 mph electric bike. That's not clever or right.