Clearly not. There are a thousand ways to read a person. And they work pretty well.

Unless you can read minds, which you can't (even with your tinfoil hat on), then you literally cannot know things which are not somehow expressed (through words, facial expressions, body language, actions, etc.). Words are the most direct way that the vast majority of human beings express themselves, as things like body language and action require third-party interpretation, which obviously adds a second layer of subjectivity, and considerable flaws in terms of misinterpretation, bias, etc.

I stated that it is a privileged class of information. One that is excluded from scrutiny because we declare scrutiny, in this case, untrustworthy.

Simply restarting your opinion may make you feel correct (which you're entitled to feel), but it doesn't actually change the objective truth:

Feelings are "excluded from scrutiny" not because "we [who?] declare scrutiny untrustworthy", but because of the simple objective truth (that almost every human being has intuitively understood since the dawn of time) that the internal thoughts and feelings of others are fundamentally unknowable, and that we rely on expression to have a window into the minds of others.

If you believe that's not true, then answer this:

If I tell you that I'm feeling hungry right now, what basis could you possibly have to tell me that I'm not?

If you can't answer that question, then you straight up have no argument in the first place, and that alone answers your original question.

So now I've lead you to water, and it's up to you whether you drink or not. I'm not going to waste any more of my time on this.