As a general rule, electric motors operate more efficiently lower in their power band. Rawlinson has, in fact, made this point to explain why Lucid motors are engineered to be so powerful and why this power, unlike with a gas combustion engine, therefore comes almost for free in pursuit of efficiency.
The Atlas motor was wrapped in mystery during the presentation, including even the blacked-out graphics. This doesn't strike me as just a scaled-down version of existing motor technology. I'm wondering if they're developing a motor that changes something about the power/efficiency equation.