I haven't clicked on the link, but I think it may be worth considering that children's chronological age does not always match their size. Say a petite 10 year old may not necessarily want to be marked out by wearing clothes designed for younger children.
I doubt they'd sell many crop tops in the smaller sizes. I'm not sure it's exactly a scandal.
I'm far more fussed about playboy branding being promoted to Tweens (who have their own pocket money to buy this dubious crap - unlike 4 year olds).