I feel like that video isn't exactly fair, unless all he was trying to do is explain the cost differences. I feel like the reviewer (a retailer) is taking a simple look without understanding engineering.
If you compare the Givi and Motec bars side by side, it's probably fair to say that due to geometry, the Givi bars, with their thinner metal, might actually still be stronger in some respects to the Motec bars.
The Motec bars have a tall loop that covers the whole fairing. The Givi bars have a smaller loop that protrudes slightly. In terms of branch/brush deflection, the Motec bars win in that respect, but I'd bet the Givi bars would actually be better in terms of tip-over or crash protection. The reviewer doesn't differentiate.
The same physics goes into bridge building. If you have a small span of bridge, you can use smaller I-beams than if you have a longer bridge. The loops on the Motec bars seem twice as long as the Givi bars. I can see why the'd need (not want) to use thicker metal. The forces of leverage will cause longer loops like that to be bent more easily, in a fall.
Granted, I have neither set, nor the urge to do some sort of destructive A/B test, but I haven't yet found a single person who's said "I bent my Givi bars", but I have found a thread with a picture of bent Motec bars (just that upper loop part!), and of course there's the complaints about the resonance at a certain RPM, I'm sure from the longer loop ringing like a tuning fork.
(which I believe could be resolved if anyone was brave enough to drill their Motec bars somewhere, to line them with liquid damping material?)
There's a lot of parallels to my former life in loudspeaker design - resonance increases (and should increase at a higher RPM) as [functional] mass decreases, so the lack of it in the Givi bars actually indicates they may be stronger in an actual, applied sense.
I do believe the powder coating on the Motec bars looks superior, I can understand why they cost more as a sum of the increased materials cost alone, but I'm just saying I think this video is a bit of an unfair oversimplification. Guy might as well have said "One bar set is cheap, the other one is less cheap." and stopped talking.