So I'm surprised to find you deciding whether somebody in a video is an INFP based on how well their communication "style" matches Jung's over-the-top (and predominantly negative) Fi-dom description. It's not as jump-the-sharky as his Si-dom description, but almost any modern INFP or INFJ portrait — whether from a dichotomy-centric source or a function-centric source — does a substantially better job of capturing those types than Jung did.
As you know, Jung viewed a typical Fi-dom as a woman whose core feature was deep, oversized passions that didn't tend to match up with anything in the real world, and so, "being shut off from every means of expression," her "intensive feeling ... acquires a passionate depth that comprises a whole world of misery and simply gets benumbed." And it's not hard to imagine any Limbic (especially) and strongly-introverted IN feeling like that description — like many of Jung's descriptions of (what he saw as) all
the introverted types' fraught relations with their "turbulent" and problematic emotions — seems to capture some of the flavor of their emotional awkwardness, and their tendency to feel like their grandest passions more typically alienate them from the "real world" than connect them to the real world.
But as a description of either of the INF types in more ordinary mode, and how they're likely to characteristically come across to others, I'd say Jung's portrait leaves a lot to be desired.