And this example does not even illustrate the long context understanding well, since smaller Qwen2.5 models can already recall parts of the Three Body Problem trilogy without pasting the three books into the context window.
Although, I just tried with normal Qwen 2.5 72B and Coder 32B and they only did a little better.
Though I would say humans would have difficulty too -- say, having read The Three Body problem before, then reading a slightly modified version (without being aware of the modifications), and having to recall specific details.
That said, once you have defined what is required, I believe you will have solved the problem.