This doesn't seem like such an egregious example to me - I tried it in a colour contrast checker and it passes WCAG AA but fails WCAG AAA for normal size text (but passes for larger text): https://snook.ca/technical/colour_contrast/colour.html#fg=5A...

I will admit I don't find the letter spacing on that font to be particularly pleasant, and if you turn the "Cantarell" declaration off, it does become easier to read (better letter spacing and thicker strokes, which latter contributes positively to the contrast).