That is ridiculous, this has been made specifically for this application, constructing an argument based upon using a material in a manner it was not designed to be used for is hilariuos. This material was designed for this purpose unlike the tarp analogy that was designed to cover, not support hanging weight. Not a good day for trying to relate this to any type of product... Strike three...
And no it is not BEHL's responsibility to test, they are an end user, they must rely upon the supplier to provide the engineering details and provide the proof of such capabilities and durability.