Written comments are very different from verbal communication which is different from charisma. So no, they definitely aren't all charismatic, far from it probably.
I think OP may mean: trope of programmers having low social IQ (aka EQ)?
There is certainly a stereotype (reinforced by the media of course) of programmers being awkward, geeky, poor communicators to non-experts, emotionally a bit “weird”, etc
As OP is talking about charisma this is what I assume they meant anyway. I could wrong so hopefully OP can clarify.
Written comments are very different from verbal communication which is different from charisma. So no, they definitely aren't all charismatic, far from it probably.
Also, "trope of programmers being low IQ"?