That's also not true. What was shown is that BTC is not secure if you don't follow the correct transaction protocol. That's obvious. So is it also obvious that mathematical security and physical security are different. Here, the attack also involves not following the correct protocol.
Why do you think that was even worth posting? It's not a profound concept to say "if you don't follow the secure transaction protocol, your transaction will not be secure."
Why do you think that was even worth posting? It's not a profound concept to say "if you don't follow the secure transaction protocol, your transaction will not be secure."