I've seen that video before and I actually think it's part of a smear campaign by the air locker makers. I think also that Eaton/Harrop took so much of the locker business from ARB, and minor players like TJM that they had to introduce doubt and fear into the buying public. In use, the Harrops are really helpful. They don't have the 25 failure modes like ARBs. But any locker that is selectable, and when failed, defaults to an open differential, is good with me.
The OEMs like Chevy (in the Colorado) and Toyota (Tacoma) are using Eaton/Harrop style lockers for a reason. They work and they don't cause problems. But again, I'm not hard on equipment, and do technical spots at minimum speed and power (usually at idle). ARBs are great. They really are. But for me, they have stopped working too many times to continue. One year the front ARB in my 6o spewed gear oil all over my motor. I was worried it would catch fire but it didn't. That for me, was the beginning of the end. Now, when ARBs need internal service, a Harrop goes back in.