I think this could be easily solved: why have a men section and a woman section only?
They could simply add a ''gender fluid'' or ''all gender'' or ''unisex'' section, or whatever term would describe best these products, for garments that are targeted at body shapes and genders.
This person is very obviously not a woman so they should not use them to advertise products that are targeted specifically at women, but there is no issue with them modelling something that is aimed at any buyer.
I am starting to think these companies just do this on purpose to create controversy and get free advertising as people share & discuss the content...
Some women already wear stuff that is traditional sold in the men's section (tee-shirts, shirts, jackets) of shops and online shops. I have certainly bought ''men's'' shirts and tee shirts in charity shops so I don't see any issues with the principle.