This doesn't smell unisex at all to me, it has a very front note of rose. I can't imagine a man smelling like a rose but you never know.
There is no strict gender differentiation when it comes to perfumes. Yes, many women's perfumes on the market tend to feature fruity and floral notes while the men's dose up on the citrusy, musky and hebral notes. However it is ultimately a question of personal preference that determines your purchase in perfume. Specifically Atelier Cologne makes all unisex fragrances. I'm not sure why/how Sephora chooses to categorize certain Atelier colognes into women's, but they are most definitely all unisex, as advertised by the company. I've not personally tried the Rose, but depending on the interpretation, it can easily be worn by a man, so it is not surprising that there are men commenting on the product.