Instead of the simplest and most obvious explanations, let’s delve into sexist narratives and reach as far as borderline conspiracy theories. /s
What could’ve happened? Alphabet replaced the column with one which, at least in their eyes, is more useful. As simple as that!!!
To me the change is reasonable. I don’t say it’s the right choice. I don’t have access to their data, after all. But it is both intuitively correct and apparently rational.