I seen this “Lingerie for men” in different styles like a bra specifically designed for men or panties with a pouch. Can’t say exactly why but to me those things are of no interest at all.
The only underwear “for crossdressers” I can consider is things like pocket bra or bum/hip padding.
As for whatever it’s crossdressing or not – I feel more like not, feels like that putting on panties with a pouch is kind of missing the point of being more feminin.
The good part with it is that maybe it can spread, the step from acceptance of a man wearing a skirt is shorter if “skirt for men” became more wide spread and “panties for men” is possible a first step in that direktion.