Compression possibly? I'm seeing .webps on the paper. Putting them into webpinfo gives me:

    File: /.../41467_2023_40499_Fig3_HTML.png.webp
    RIFF HEADER:
      File size: 671810
    Chunk VP8  at offset     12, length 671798
      Width: 2000
      Height: 2255
      Alpha: 0
      Animation: 0
      Format: Lossy (1)
    No error detected.

So since they're lossy, maybe the subtly is lost?

Edit: The image on the article itself is an SVG, containing 3 jpegs. So that's absolutely mangled in comparison to the paper's lossy images.

https://deepmind.google/api/blob/website/images/Figure0_svg....