That's a lie. Or, at least, there's another existing normal motor that can achieve at least nearly the same results. Existing motors are already 90+% efficient; it's not possible to make a 50% increase in range.
If that's the case, however, it doesn't really bode well for them, as their efficiency gains will not translate to the high-RPM, high-power motors used in cars. I'm not EE, but I do know that most engineering involves making trade-offs. So I wouldn't be surprised to learn that techniques to improve low-power, low-RPM efficiency probably sacrifices high-power, high-RPM efficiency.