The larger point is correct, but he's getting a few things wrong here.

• the revolutionaries weren't 'enlightened' per se, they were followers of Rousseau. The mainstream enlightenment, even in France, was not associated with him. And in fact, they beheaded some members of that mainstream enlightenment. Though obviously they created the path for this disaster.
• they did not change it in the name of science. In fact, the word was not used back then. Back then, such lunacy happened in the name of reason. There is a difference. Robert Conquest, the great historian, points out that utopias in the 16th and 17th were based on theology, in the 18th and 19th based on 'reason' and in the 20th based on 'science' (Marxism was advertised as 'scientific' socialism).

Most Americans underestimate the disaster that was the French Revolution. The Bolshevik revolution was a follow-up on the French Revolution. In fact, the Bolsheviks modeled themselves after the 'Jacobins', the craziest of the revolutionaries, while denouncing their opponents as 'Girondins'.