Cambodian older foreign husband ban discriminatory?

That's what some people think of this new Cambodian law: Cambodia sets marriage age limit for foreign husbands

But being over 50 is not the only obstacle: even younger potential husbands-to-be have conditions they must fulfil.

The weird thing is that there's no ban on foreign women, of any age or income, only men.

Authorities have mentioned aesthetic considerations, but surely there must be something else behind the whole thing.

I wonder what would happen if hordes of older European or American women went down there to pick up younger trophy toy-boy husbands?