No biological determinism (as far as I know, because I'm unfamiliar with the term) here.
It's unhelpful to baldly say "Men are as different from each other as they are from women" when it's patently not so.
If you say there is huge variation in: height, weight, behaviour, aspiration, aggression, socialisation between individuals, that's obvious and a truism.
The contrary position would be women are as different from each other as they are from men - which in these terms is - I'd aver - a truism.
I'd add that many feminists seem to suggest there is a category difference between men and their behaviour and women and theirs - which seems to also argue against this.