If a country with 220/240v electric kettles, I can believe it... but in the US the electric kettle is probably 110/120V at 12-15 amps, then I would think an induction stove kettle could be faster, no?
Induction power is still limited by pot diameter and common cookware is very heavy for water boiling because other types of cooking need more even heat and higher temperatures.
I actually raced a 120v kettle versus and high-end induction stove to boil 1l and it was very close.
Electric kettles are very well optimized for speed and efficiency.