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| does anyone know if more recent machine learning techniques have made their way into the field?

Oh god I hope not.

The paper is written by behavioral geneticists and thus merits some skepticism. As another commenter notes, many of their “top 10 findings” are basically statements about statistics.

Machine learning is for identifying pictures of cats. Regression is for testing the statistical significance of the estimated effects of your variables. Right tool for the right job.