(un) Security - Who will guard the guards?
This has been debunked. It's not a backdoor. It's debugging commands.
From security perspective, do you think the wording changes a lot here?
Absolutely yes. A backdoor implies its available via remote access of some sort, not something that requires low level code access to the microcontroller. Huge difference.
I understand your point, but I would not imply that a backdoor has to be remote. Backdoors are essentially any alternative, often undocumented ways to access or gain privileges on systems. They don't always result from malicious intent either - many backdoors simply "happen" when developers haven't fully considered security implications. For the average user whose device contains such unintentional backdoors, the impact remains the same regardless of how they came to exist. Consider the times when vendors had default BIOS passwords - these created a nightmare for Uni IT staff (and others as well), even though they were not accessible remotely.