CR test did not refute Unbox video
The problem with the CR test method was that it applied a uniform force across the entire width of the iPhone 6+ (the structural strength of the device was sufficient to handle reasonable load). The Youtube video revealed that a non-uniform force applied to the side of the device adjacent the button cutout would result in a structural failure. Further analysis by iFixit.com revealed the internal steel reinforcement plate is anchored (screwed) too close to the lower edge of the button cutout. This has created a stress-point. When force is applied in such a way that this point becomes the center of moment (fulcrum), the device's ALU case plastically deforms.
It's a design flaw that seems to be revealed in plausible use scenarios and therefore well below acceptable industry/consumer expectations. Let's see how Apple will respond as more relevant data is accumulated.