This caused me to search a bit about that scene. I wasn't aware it seems to be extrapolated from a technique actors use to memorize lines.
"He came up with this process that actors use to learn Shakespeare, where you say a word, then they repeat the word, and then someone would ask a question about that word. It’s to induce specific memories linked with a word, so they remember the word forever. I transformed that process to make it intrusive, where instead of having someone repeating a long, long sentence, they will be more aggressive – they’re asking questions about specific words."
"He came up with this process that actors use to learn Shakespeare, where you say a word, then they repeat the word, and then someone would ask a question about that word. It’s to induce specific memories linked with a word, so they remember the word forever. I transformed that process to make it intrusive, where instead of having someone repeating a long, long sentence, they will be more aggressive – they’re asking questions about specific words."
Pretty interesting background on this here: https://www.denofgeek.com/movies/blade-runner-2049-how-a-key...