If he said that about AWD he’d have gotten it backwards.
Traditional AWD will let all your engine’s power flow to the freespinning wheel, while the other wheels under tension will lose power.
This ia so that you can make turns at high speeds without side slip and ruining your tires and so on.
AWD will lose torque on contacting wheels if there’s a free spinning wheel.
Now he did explain that in some newer AWD vehicles there’s a sensor that will divert power to the contacting wheels or even lock the differential if it senses a free spinning wheel. But that’s not a normal part of AWD.
