I'm sorry you think it's arrogant. If I were to talk to the authors, I'm sure they'd say either: "yeah, it wasn't our cleanest work but we had a tight deadline" or "thanks for the tip, we never heard of secure triggers."

Any high-end agency would never say the latter, so either there were severe time pressures or this was Team B. The narrative that this is highly polished work of a high-end agency (4! I mean 3 0-days!) is not supported by evidence.