Both are correct but it’s a misleading argument. Yes on a geological time scale volcanic eruptions have had a greater impact on the climate that humans have.

However that doesn’t change the fact that we fucked up the planet for ourselves by effectively producing a slow burn volcanic eruption over the last century. This wouldn’t really be a big issue if we hadn’t also exploded our population to the point where we now need all of the land on the planet to feed everyone, and a drop in agricultural output would be catastrophic.

It’s just that on top of that you can also lay awake at night concerned that the planet itself might decide to kill all of us at a moment’s notice and there would be nothing we can do about it. See: Permian extinction