[muraiki]

It's worth noting that the paper was submitted in August of 2021. So perhaps it took a year to develop the methodology and get the paper ready for publishing. They did use separate training, validation, and test sets for data, although we do need to trust that the test set was only used a single time. To whatever extent the model doesn't do as well in 2022 as it did at the time it was created, that comes down to concept drift and data drift.