I like that Meryl spoke out about it. Although I don't know that shes going along the same angle, it has always bugs me that female athletes never get the same endorsement opportunities with sportswear companies that male athletes do. It's basically saying "You might have won multiple world championships or olympic medals, but that's not merit enough on its own, you have to have model level flawless looks" And as a consequence, it's the looks that are more important than the achievements. It's part of the bigger picture of women's sport not getting the same recognition as men's; I can't think of a single major sportswear brand that has chosen to use a male model or non athletic celebrity to front an advertising campaign rather than a male athlete. Maybe Nike or Adidas for campaigns for their fashion footwear, but never for the serious sportswear. But looking out of my office at the windows in Niketown London, I can see a campaign for running gear featuring Mo Farah for the menswear & group of female models for the womenswear - and this in a year when British female athletes won 3 Olympic track medals. One of those women, Dina Asher Smith, is also the British record holder at 100m & 200m, and is signed to Nike, but I have never seen her fronting the billboards on the Nike store in the way the male athletes do.
And yes, not everyone who wears athletic clothes is an athlete, but equally, they aren't a model or instagram star like Bella Hadid or Kylie Jenner, so it's an image as equally removed from most people's reality as using an elite athlete.