Terrible contrast? Firefox's accessibility inspector gives the text a contrast ratio of 15.17, with 4.5 being the minimum for what qualifies as good and 7 as the recommended minimum for good readability.
I change text colours in the web inspector a lot because plenty of websites these days are medium gray on light gray with a font-weight of 100, but this clearly isn't one of them. It's fine to say you don't like the colour, but the contrast is great.
It's not that the contrast is low (which is another problem on its own, I agree). It's the other extreme - too high of a contrast [1] by using a fully saturated yellow and black. The same reason you don't use #fff on #000.