> it means "nobody but us can actually use the backdoor". Ironically, the Juniper PKRNG backdoor --- I assume it was Chinese --- is also a NOBUS backdoor!

Except that it was intended to be "nobody but the us (i.e. the NSA)" and now you've got China using it.

No, we don't. Respectfully, I don't think you're working from an accurate notion of what "NOBUS" means, and I don't think you have your head fully around the Juniper hack. The Juniper hack replaced the existing backdoor; it didn't break it.

NOBUS or not, if your adversary controls your source tree, you're boned. Here, the adversary replaced "our" NOBUS backdoor with theirs. Two different backdoors, different keys, same structure.