> The author isn't saying that biological differences are the _only_ factor; only that that they are _a_ factor...
This is true, but as /u/taysic pointed out elsewhere, Damore dedicates the majority of his memo on this this one factor and wishes to change corporate policy because of it.
> ... and that Google has been completely neglecting that factor with the current implementation of their efforts to improve diversity within the company
Perhaps Google is evaluating more factors than Damore? Perhaps Google concluded that social issues and gender bias play a larger role in workforce disparity than biological issues, and therefore decided to prioritize attacking the larger problem over the smaller problem?