It's a fetish, @baddecisions11 . He has deliberately written a review, not to help other male customers select underwear but because he enjoys involving random non consenting women in his fetish.
I'm not keen on that, surprised M&S are.
And even if it stopped there, men with paraphilias escalate. So if not stopped trying on women's underwear at home, they do it at the store. If writing about it isn't enough, they flash. And so on.
There's a bloke in my area whose insta is full of selfies of him trying on women's clothes in women's changing rooms, in local shops, flashing his dick.