Yes they did insert the answer. And yes I know they just did it as a test. What I’m saying is that what they’ve proven may be interesting, but it’s in no way useful, and what they proved was quite obvious without even doing the test in the first place. Of course injecting an answer directly into the middle of context, in some contrived scenario (where you have the answer already in hand, ahead of time) is going to improve results. But so what? How is anyone going to use this knowledge to get any actual improved performance?