Can you point me to some of those studies, please?
It sounds extremely sexist to me to make such a claim. My experience with men has been different as well. Also my experience with women (they are not all timid about their opinions).
In any case, I don't see the relevance of the theory to the Wikipedia incident. So why does she quote it? Because the Wikipedia editor happens to be male, and the quote is supposed to discredit all male opinions.
She wrote a whole blog article about it - is that an example of "an informative messages phrased as a suggestion, offer, or other non-assertive acts"? I don't think so - she disproves the theory, yet you defend it.
If you are a woman, you also disprove the theory, because you claim a fact: "But it's not drivel. Men and women communicate differently, that's supported by many, many studies." That's not a suggestion, offer, or non-assertive comment you made.