He does a provide a source in the form of a wikipedia article that uses actual citations [1]. The version with sources (gizmodo removed them in their first publication of the memo), is located at [2].
As for your comment on his "blatant disregard for social context", he explicitly mentions that he believes that biases should be corrected and that society probably also is to blame [3], he just doesn't believe that biological factors does not play any role at all.
As for your comment on his "blatant disregard for social context", he explicitly mentions that he believes that biases should be corrected and that society probably also is to blame [3], he just doesn't believe that biological factors does not play any role at all.
[1] https://en.wikipedia.org/wiki/Sex_differences_in_psychology#...
[2] http://diversitymemo.com/
[3] http://diversitymemo.com/#suggestions