Been saying this with students whenever someone asks me if their voice passes.
"I cannot be an neutral judge of that, if passing is the lack of knowledge that someone is trans, then I cannot lack that knowledge unless you hit me really hard in the head."
I’ve said this a million times: you can’t tell someone else they pass. Passing is not an innate quality, nor is it subjective.
It’s context-dependent and empirical: you pass if people around you think you’re cís. You don’t know if someone else passes. You can guess, at best