Paywall, can't read the article, but if the image at the top of the page is the model in question it is difficult to tell. Yes, she is very slight, but covered up in the way she is I couldn't say if she was dangerously underweight or just small.
If she is borderline anorexic, then yeah, I think it is correct to ban the advert, it's harkening back to the mid 90's when "Heroin Chic" was a thing, and is still, to a degree today.
Personally, i'd just prefer any advertising, fashion or not, just used average, everyday people you'd see in the street, but we're a long way from that, even with the few "Body positivity" models some brands use.