You are suggesting the people who read HN and might click over to the "open Twitter" codebase won't understand it? Engineers don't exist in a vacuum, the same

You are suggesting the people who read HN and might click over to the "open Twitter" codebase won't understand it? Engineers don't exist in a vacuum, the same engineers who write the algos are here on HN. Show HN the Twitter source code and a lot of engineers will understand it. What is more likely is that the engineers are currently bound by NDAs and can't say what influences the algo.