I agree completely. Without knowing the spring constant it is tough to say. Although, if they could increase it using thicker tubes it could have applications as shock absorbers in landing gear. I would not be too surprised if they just went as light as they could for the press release. In the end, without a list of mechanical properties it is impossible to say. On the other hand, it could be completely useless and they just wanted to get some good PR out of a failed idea.