[folkrav]

The size looks the exact same as this very site to me. It's #5e5e5e (effective, as it's actually a slightly transparent RGBa value) against #fff, so a contrast ratio of 6.48:1, well within WCAG AA standards, and a tiny, slight shift to #595959 would be enough to meet AAA.

[gabrielsroka]

Chrome Lighthouse on both mobile and desktop said that TFA did not have a sufficient contrast ratio.

It doesn't look too bad on my desktop, but on my Android which is set to 130% it's almost unreadable. I had to use reader mode.

And it doesn't resize on mobile, probably because they're using px in their CSS instead of em or something scalable.

[folkrav]

You were specifically speaking about serif grey text on white, which is pretty much what I just told you - WCAG AA compliant. [1] You weren't talking about Lighthouse nor mobile specifically, so I just answered with whatever info you gave out.

[1] https://i.imgur.com/SF5WTCa.png