This descriptions does not sound like it's about something that is "virtually unbreakable" : "The sample looked like an ordinary piece of glass, 4 inches square and transparent on both sides. It’d been packed like the precious specimen its inventor, Adam Khan, believed it to be—placed on wax paper, nestled in a tray lined with silicon gel, enclosed in a plastic case, surrounded by air bags, sealed in a cardboard box—…
Also according to the agreement Huawei was not supposed to "break" it. I am not sure how they are supposed to evaluate it without scratching at it.
No matter what they intended/wanted to do, they signed a contract not to break it. Ain't nothing much to debate there.