'biology isn't destiny' is such an unapologetically stupid phrase that I wonder whether you really mean it.
Where to start?
I could discuss the impact of all sorts of medical conditions, but I will stick to sex.
Do you think women can knit their own contraceptives from grass? Turn their bodies off and on again if they don't want to be pregnant? Do you think doctors give the same fertility treatment to men and women just in case? If rights to maternity pay ended tomorrow, do you think this might have a particular impact on a particular group of people? There has been a lot of discussion about about the impact of menopause, but I gather that you think the biggest mystery is who might be affected. Do you think female runners are just lazy? That a woman could break the 100m record if she just trained harder?
Women rely on a whole framework of rights that men don't need. This doesn't place them on some kind of hierarchy. It just means that they need rights that are specific to their sex. My ability to receive an education and earn money has depended on my ability to control my fertility. This is a relatively recent right in the history of human existence. It is a sex based right. If I were a man I could just use my feet to run away from an unwanted pregnancy.
I don't want anyone to feel afraid, but a women's space that is only for some women (cis) is not a proper women's space to me.
I agree that it would be odd to restrict a space to women who identify as 'cis'. They could all have a lovely time discussing how much they identify with their oppression. However, nobody except you is suggesting this.
I find it difficult to believe that you are trying to defend trans rights in good faith, because your arguments are just so bad. I'm really not sure what you are trying to say with your aftershave story, but I don't think that even the GLP will be using it.