Ok, well it’s wrong. 230V is more dangerous than 110V, all else being equal.
It's not wrong. 110V is more likely to cause fibrillation. Fibrillation isn't the only way AC can kill you so which is more dangerous is more debatable.
The problem is that the risk of death is so low for both that people's perceptions are skewed. Everybody has been shocked by their household voltage a bunch of times, so they think it's no big deal. Until it isn't.