Well, yes and no.
The Bavarian Illuminati he references indeed functioned as an organization during the period he discusses.
However, the Illuminati identified with and considered themselves descended from various earlier masonic and anti-Church movements such as the Fratecelli, Rosicrucians, Albigensians, etc.
The Church did indeed massacre some of these movements.
Whether the quote from the movie is historically accurate would depend to some extent on the context of the discussion.
Given the general lack of interest in historical accuracy in Brown's writing, I'd be quite surprised if it is accurate.
The Illumini were want to associate their cult with any organization that vaguely resembled theirs. It was part of the freemasons who in Catholic countries were bitterly opposed to the Church. They freely made stuff up. The utopian socialists of the early 19th Century copied them, including their rituals.