DC ("brushed") motors won't be affected by that, especially if controlled with no transistors. See for example how old DC-powered electric railway rolling stock was built, from pre-power electronics era.
Brushless motors have been the norm in e-bikes and e-scooters for a long time. And even modern brushed electric motors in EVs have electronic control via microcontrollers. There's no way you can get maximum power efficiency out of it without software control.
>And no, you don't have brushed motors in modern EVs
Would you be willing eat your words? Plenty of EV motor designs from Continental, ZF and Chinese companies are brushed (or other forms of physical shaft contact with slip rings). Not every EV is BLDC due to the desire to give up on expensive rare earth magnets on budget models.
The part where you go "nuh uh, this won't work on motors that no mass-produced electric bike or scooter ever uses". It probably won't work on horses, either, but that's not what TFA is about.