Any backdoor can be used by any government. It may take time, but it will be found and exploited. All they're doing is passing the buck... your buck, that is.
A cursory internet search reveals several that popped up within the past decade on Cisco's gear. Hard-coded passwords are table stakes, if that slips through, what else is lurking beneath the surface?
Network hardware is to operate in the adversarial landscape which is the open internet. It requires an extreme, exhaustive workflow to ensure bugs do not slip through. That we repeatedly see these failures does not raise confidence.
