This test is worthless in a few weeks, it's now going into the training data. Even repeatedly posting it into LLM services (with analytics enabled) could lead to inclusion in the training data.
Interestingly, this test has been in the public domain for the last seven years, since it is part of all possible chess games with 7 or less pieces, which is solved and published. It is a huge file, but the five pieces games dataset with the FEN is less than a GB. I wonder if it even got included in the training data earlier, or if it will be.
I don't think such datasets are going into AI training. But if this exact question keeps showing up in analytics data, and forum posts, it might end up in training sets.