He's part right. The populist / Buffy the vampire slayer / girls can do anything boys can do type of feminism that was strongly pushed in the media while I ws growing up did obscure the degree to which male bodies are faster and stronger than female bodies. I didn't realise the degree of difference until I saw the elite sportswomen vs high school boys stats on here. Nor did I know just how stark the sex difference is in sex offending stats.
There was also a feeling that women's physical differences to men were used as an argument that our minds/capabilities were also innately different and this made us not suited to the various high power/status roles in society, and mentioning our female bodies was playing into that narrative. To be valued and empowered as much as men, we had to have no meaingful differences to men.
So, you had this context where physical differences were not really being acknowledged.
Then into that comes the trans narrative and at first it does seem feminist = "hey look, male people can behave and act in traditionally female ways, that subverts sexist ideas about women, right?" and "These men are refugees from toxic masculinity, they are like us".
It took a while to realise that when they say "trans women are women" they don't mean it as a metaphor, they mean it totally literally, and they are not subverting society's outdated ideas about what is innate to womanhood but reinforcing them, and they are not feminist allies who sympathise with women trying to carve out their own safety and power in the face of the entitlement and violence of toxic masculinity, they are simply exhibiting the same entitlement in a different way.