How can trustworthiness be objective while trust is subjective?
True. Trustworthiness is probably not a good word. What I meant was that trustworthiness could be construed as a objective measure (such as that reached by diligent security and privacy experts), while whether or not you actually trust someone is basically a feeling. Maybe "Fitness to be trusted" is a better term?
Your intended meaning was very clear since you used parenthesized qualifiers. IMO any argument on your usage is pedantic at best, but I would have put it as perceived and empirical/actual trustworthiness.