Oh thanks for this! I had the same question and assumed the Omega branding and Olympic rings were superimposed onto the image; I never assumed it would actually be an animated advertisement timed perfectly to match the runners' pace! I assume they had a different backdrop speed for the women's race, according to their projected pace? Or would the ad look squished for them? (or alternatively, the runners stretched?)

Now that I look at it, the logos in the men's photo finish look stretched, so maybe it's calibrated for the women's pace.