This is bad form.
> But there is not even a single high-profile hardware
> backdoor incident publicised. This tells you something.
Not so much. If the US military found a hardware backdoor, would they want to publicly tell their enemy that their strategy is effective? Not only this, but if they tell their enemies which ones they find, by doing so they also tell them which ones they haven't found.
The only reason details of these fakes were published was likely because the Chinese company couldn't reasonably be considered as acting maliciously in this regard. Rather, they were just trying to turn a quick buck.