“It’s absurd to think that we would be nudged by one typeface over another, into believing something to be true. Something disturbing about it, I’d go so far to say.”
It's really not disturbing.
It's obvious that the way something is presented can affect your judgement about things like the motives (or credibility or even identity) of the person saying it, and it's obvious that this will in turn affect whether you believe what you're being told. Things like tone of voice, choice of words, and typeface all have an effect.
Why does it surprise people that the manner in which you communicate can affect how likely people are to believe what you're saying?