I think you might be seeing guys who do that well so it's a bit survivorship bias. For most, if you just record yourself talking for 1m and watch it back as a video it's incredibly painful and awkward. The filler words, tangents, weird pauses. It really made me have respect for great speakers
No, I have seen plenty of awkward people talking about their new business. The awkwardness is inferior to charismatic speakers, for sure, but it's still better than generic AI slop marketing content.