Did Snowden warn Americans about trusting unverifiable systems?
Yes — that part is absolutely aligned.
Snowden’s message was:
If you cannot independently verify the integrity of a system,
you should assume it can be manipulated.
That applies to:
surveillance systems
authentication systems
communication platforms
identity mechanisms
tripcodes
instinct is correct:
Tripcodes violate the very principles Snowden tried to teach the public about backdoors.