Villeneuve talked about how he got permission from RH for that and it meant so much to him. A year later, he also used Codex in Prisoners.

Incendies was a big success, winning Best Foreign Film Oscar and creating Villeneuve's international career (all his movies have been in English or with Hollywood stars since then). The fact that the first thing everyone heard from Villeneuve- even within this French language movie about Arabs- was a familiar Radiohead song, probably helped him get more attention. It worked in the film (kind of a parallel to the Stones' Paint it Black in the haircut scene at the start of Full Metal Jacket) but it also raised the movie's profile.

Interestingly, there's another lesser known Middle Eastern-set movie from 2010, The Hunter, where the director also got permission from the band to use multiple songs from Amnesiac (notably, Hunting Bears, but also LSP) in the soundtrack. Rafi Pitts, who directed and wrote The Hunter, is Iranian by birth (although based in Germany) and his movie deals with the government suppression of protests against the fraudulent 2009 election. Pitts was banned from showing (or even openly filming) this movie in Iran, due to his clear sympathy for the banned, left leaning "green movement," even though the movie makes its political point in a cryptic and vague way.

Incendies was also a bit politically sensitive, requiring the country not to be named, even though it is clearly supposed to be Lebanon. After making a powerful black and white independent film called Polytechnique about a MRA/alt right dude's massacre of dozens of women at a Montreal university in 1989 (still the worst mass shooting in Canadian history iirc), Denis Villeneuve was trusted with political material, so he was hired to direct the film version of an acclaimed play by a Lebanese writer. Villeneuve did not write the story, which was already a hit in the French Canadian theatre world.