More importantly the video mostly talks about hitting the Sun from a platform like Earth already closely orbiting the Sun, which is not the same thing as arrivi

More importantly the video mostly talks about hitting the Sun from a platform like Earth already closely orbiting the Sun, which is not the same thing as arriving practically from interstellar space. That's much more important than the size of anything. If you were to make a velocity change to this object in its aphelion to make it hit the Sun, it would be vastly easier (at least per unit of weight) than do the same with a probe launched from Earth.