It should be trivial to measure performance these days and figure out if there indeed is/isn't any biological difference or if certain parts of DNA/cultural background etc. are the decisive factors. It's Google anyway, "The ML company". They should internally test this hypothesis and then publish their findings (hopefully they can do objective studies with high integrity). If diversity programs cause them become less competitive, they will wither at some point; if diversity helps them they will earn economical success (unless all companies become alike). They have a perfect playground internally for that.